Bulk Reef Supply

150 GPD Water Saver Upgrade Kit

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Why does BRS recommend this?

The 150 GPD water saving upgrade kit is probably our most recommended RODI upgrade. If you have proper pressure (65+ PSI) we highly recommend installing the kit, because it will produce water twice as fast as a standard 75 GPD membrane while cutting the amount of wastewater in in half.

The BRS 150 GPD Water Saver Upgrade Kit will increase the production of any BRS 75 GPD reverse osmosis system to 150 GPD without having to use any additional water. With the installation of this kit water production will increase from approximately three gallons per hour to six gallons per hour! It does require 65psi or more into the first membrane in order to function properly and be effecient. If your home's water pressure is less then the recommended PSI do not worry, adding a booster pump is simple and only takes a couple of minutes.


Recommended Conditions:

  • Minimum Water Pressure - 65 PSI
  • Max Water Pressure - 90 PSI
  • Recommended Water Temperature - 77°F
  • Recommended Max TDS - <300ppm

Water pressure can be increased by adding a booster pump before your RO/DI system if a pressure increase is required. Low pressure will cause slow production of product water, with excess production of wastewater. Pressure over 90 PSI may cause damage to the RO/DI units filters and components.


Recommended Flow Restrictor - 550mL/min


What's Included?

  • One Dow 75 GPD membrane
  • Two 2.5" x 2.5" membrane clips
  • Two 1/8" x ¼" 90-degree elbows
  • 1/8" x ¼" 90° check valve
  • RO membrane housing
  • ¼" tube splitter
  • 5 Feet of Red, White, Blue and Black RO Line


DOW Filmtec 75 GPD Membranes have a 96% - 99% typical stabilized salt rejection rate that can be reproduced through the following conditions;

  • Source Water Pressure - 50 PSI / Membrane
  • Source Water Temperature - 77°F
  • Source Water TDS - 250ppm Softened Tap Water
  • Recovery - 15%
  • Minimum Salt Rejection - 96%


If you are purchasing a reverse osmosis unit from us at the same time as this 150 GPD Upgrade Kit please mention in your order comments if you would like us to install the unit for you.If you select this option, there may be a one day delay in shipping your order due to additional time considerations. 150GPD water saving upgrade kit is not recommended for units with high TDS* or drinking water systems**.


*High TDS - Source water with high TDS we do not recommend using the 150 GPD water saving upgrade kit. If used you may experience increased DI consumption. The system will work as intended increasing filtered water production rate and decreasing the amount of waste water, but the overall amount of TDS that comes out of the system may be slightly higher than a single membrane system. Because of that your DI consumption will increase. We do recommend using two DI canisters for 150 GPD systems.

**Drinking Water RO Systems - When filling up the pressure tank will increase the back pressure, in turn will take longer to fill and increase the waste water produced by the RO system. We highly recommend a permeate pump for these applications to minimize waste water.

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SKU 200432
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Product Questions

Would there be any added benefit of adding the Aquatec Permeate (ERP 1000) to the BRS 150 upgrade kit? I have not really seen any demos on the ERP 1000 system so not sure how it operates. I did see that it may be more beneficial when filling pressure tanks, any benefits there for straight water production?

Thank you,
Ted Lacey
Question by: Ted on Jan 16, 2018, 6:04 AM
There is no benefit when it comes to filling water reservoirs. They are designed for pressure tanks to help increase the output pressure of the production water line, but will not increase the production if there is no back pressure being produced.
Answer by: Charlie on Jan 17, 2018, 7:52 PM
Does this kit come with the y coupling used before the shut off valve?
Question by: jon kramer on Jun 7, 2017, 11:02 PM
The "Y" style tube divider fitting is included with the upgrade kit.

Have a great day!
Answer by: Zack on Jun 13, 2017, 8:33 PM
Is a flow restrictor needed or is one already installed on the kit
Question by: Caleb Mathews on May 29, 2017, 8:02 PM
This is meant as an upgrade to an existing system with a flow restrictor and does not include one of its own. If you do need a flow restrictor, you'll want one for a 75gpd rated membrane, not 150.

Have a great day!
Answer by: Zack on Jun 7, 2017, 1:52 PM
Is it a problem to use 2 - 100 gal membrane instead of the 75 gal upgrade kit ? Thanks
Question by: Mike on May 22, 2017, 4:10 PM
While it's certainly possible, it's not something we would typically recommend. In order to run two 100gpd membranes properly, you would need a significantly higher starting and operating pressure. In addition, 100gpd membranes do have a slightly lower rejection rate, so this will typically lead to more penetration of contaminants, which in turn puts a higher burden on the 2nd membrane and the DI resin. If you were to switch out for 100gpd membranes, you would also need to purchase a matched flow restrictor as the 500-550mL restrictors are not rated for use with the 100gpd membranes.

Hope this helps!
Answer by: Zack on May 25, 2017, 4:20 PM
I have heard that running membranes in series like this can create hard to diagnose issues with water quality long term due to an insufficient volume of flush water on the membranes. This came from a municipal water guy that indicated that while parallel membranes were ok, running them in series would result in shorter life and the possibility of impurities bleeding through over time. Is this a safe solution long term particularly on delicate sps dominant systems?
Question by: John Hellrung on May 14, 2017, 10:37 AM
Hey there,
It is true that running membranes in series is a bit of a trade-off. This can somewhat shorten the life of the membrane, particularly the 2nd in series in some cases and will slightly increase the TDS of the output water, which then in turn may impact DI resin consumption. For this reason we don't normally recommend these units for use on high TDS source water (over 200ppm). For municipal water systems with relatively clean water and low to moderate TDS, the overall impact is very low and is typically worth the trade-off for the increased efficiency in water usage and production rate. This is of particular interest to many of our customers in areas where water costs can be high and efficiency is a key concern.
Answer by: Zack on May 17, 2017, 11:48 AM
Can u use 2 upgrades on one unit ??
Question by: Peter k on Dec 7, 2016, 9:49 AM
Great question! It is not highly recommended to utilize more than one 150GPD upgrade kit on your system. This is due to the elevated TDS levels that feed the additional membranes as well as the affect on water pressure. Essentially, adding a third membrane will not only drop your operating pressure, but significantly increase the TDS coming out of the RO membranes. The elevated TDS will end up costing you more in DI Resin consumption. :-)
Answer by: Randy on Dec 7, 2016, 12:54 PM
I'm new to this rodi stuff but I want to upgrade my system witch is a 90 gpd .I want to know what size membrane do I need . Can I use something bigger ..thank you
Question by: Darren on Nov 30, 2016, 6:55 PM
Great question! With your current unit, you may need to change your current membrane with a 75GPD membrane. You may also need to change the flow restrictor to a 500mL restrictor for that membrane. After that, you will be able to easily add a 150GPD upgrade kit. :-)
Answer by: Randy on Dec 13, 2016, 8:29 PM

Would there be any bennifet to adding this upgrade to my system? Would it reduce waist and increas product water any more than what the system is currently producing?

If it would help, how many ro membranes could be used in series to reduce waist water to a minimum?
Question by: Travis Meyer on Nov 24, 2016, 2:18 PM
Great question! The 150GPD membrane upgrade will reduce the waste water to product water ratio from 4:1 to 2:1. It is not recommended to use this upgrade with households that have TDS higher than 250ppm. Ryan talks about this in the video listed below. :-)

Answer by: Randy on Nov 25, 2016, 7:50 AM
Would this be worth it on a well
Question by: Aaron on Aug 5, 2016, 6:08 PM
Hi there,
Depending on the pressure that your well pump is able to produce you may need to purchase a booster pump to efficiently run the 150gpd water saving upgrade kit. The kit does need about 65 PSI to operate, where most wells will shut off around 40 – 50 psi. The kits really help reduce the overall amount of waste water produced per gallon of product water. Usually on a well, since you don’t have to pay for incoming water, the waste is not so much of an issue as simply just the speed that water is produced.
Answer by: Charlie on Aug 8, 2016, 9:36 AM
Hello, what are the TDS readings after filtration? I have an RO/DI unit that has two lines. One straight from the RO membrane and the other from the DI membrane. RO is around 20 ppm and DI is 0. Just wondering if this addition would produce the same result.
Question by: Eric on Jun 14, 2016, 11:16 PM
Great question!
If your current single RO membrane has a TDS leaving of 20 the second water saver membrane will have an increasing effect on the TDS as it runs off of the higher TDS waste water from the first membrane. Typically this will increase the TDS up to 30 or so and has the negative impact of decreasing DI resin quicker with your source water. The benefit is that the waste water ratio will be cut in half so less water is thrown away. Usually we recommend the 150 GPD upgrade if your TDS coming out of the first membrane is less than 10.
Answer by: Connor on Jun 15, 2016, 10:24 AM
How long should I flush the membranes for and how often?
Question by: Lenny Saint on Jun 10, 2016, 9:08 PM
Great question!
The membrane can be flushed for around 5-10 minutes before and after each use. Feel free to let us know if you have any further questions!
Answer by: Connor on Jun 14, 2016, 4:16 PM
I'm getting 58 PSI according to my pressure gauge. I understand that 65 psi is what is required for this to effectively double the output. Will this operate, albeit less efficiently, with sub 65 PSI or is 65 what is really needed for this to be effective. At 58-60 PSI is the improvement negligible or will this be close to double the output?

Question by: Fred on Jun 10, 2016, 6:50 AM
Great question!
With less pressure your system will still have improved performance however the second membrane will be under less PSI and not keep it at a 2:1 ratio most likely closer to a 3:1. Feel free to let us know if you have any further questions!
Answer by: Connor on Jun 14, 2016, 10:50 AM
Hi, I have a 75 GPD setup with a 550 flow restrictor. If I upgrade to the 150 GPD, do I need to change the restrictor to a different size?

Thank you.
Question by: MICHAEL DONLEY on May 17, 2016, 9:00 AM
Great question!
This kit will actually only add another 75 GPD membrane and not switch the membrane meaning your flow restrictor will be the same as you currently have (550).
Answer by: Connor on May 18, 2016, 2:38 PM
I have a APEC Water ROES-50gpd System
Will the BRS 150 GPD Water Saver Upgrade Kit work on the apec 50gpd system?
Question by: Wasim on May 3, 2016, 10:46 AM
Not really,
In order for the 150 gpd upgrade kit to work you would need to change your current membrane to a 75GPD membrane and the flow restrictor to 550mL. After these adjustments have been made you can add the kit on.
Answer by: Connor on May 3, 2016, 4:52 PM
Wondering if this addition would work on a 50gpd unit made by another manufacturer?
Question by: Zach on Apr 22, 2016, 5:57 AM
Great question!
This will include a 75 GPD membrane and as they are different sizes the unit will either need another 50 GPD membrane instead to match the current flow restrictor or the flow restrictor and current 0 membrane will need to be changed to work with a 75GPD.
Answer by: Connor on Apr 26, 2016, 6:34 PM
What would be the correct size flow restrictor with this kit Now that your running two 75 GPD membranes?
Question by: Jeremy on Apr 20, 2016, 9:52 PM
Great question!
The flow restrictor will remain the same as the water flowing through both membranes will still need to be the same. The 550mL flow restrictor is recommended.
Answer by: Connor on Apr 26, 2016, 2:41 PM
ok so i know you say not to put it on if you are using it for drinking water. i am on city water and have about 70 ps pressure. we use it to make the water better then the city and the carbon filters should do virtually the same as those pitcher filters so i dont see why the caution. also what affects on the pressure tank? i ask because i have a one way check valve on the line going out to the pressure tank that is plumbed in after the ro membrane and before the DI. what effect have you seen when using it with a pressure tank for drinking water?
Question by: charles on Apr 7, 2016, 11:51 AM
Great question!
Th 150 GPD upgrade kit should not be used on the drinking water systems as it will not reduce the amount of waste water being produced. The pressure will have the same ratio as a single membrane. Additionally the Tank will have a short life span. The TDS from the second membrane will increase allowing for a higher amount of TDS into the drinking water. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 7, 2016, 10:31 PM
Hi there I ordered the 150 gallon upgrade to my RO system at home( for drinking purposes not for a reef ) I just ordered it so I have not received it yet but I was curious to further eliminate all waste can I put a auto shut off valve with the float on my barrel I'm saving the waste water in? Will that essentially shut off the RO system or will it cause damages to my RO unit? Thanks for your time!
Question by: Nick on Mar 17, 2016, 1:13 PM
Great question
If you were to plug in a float valve on the waste water and the container was completely full and no waste water would come out it would cause damage to the membrane as that is now the only exit for the water. This will result in much lower quality water making its way through the membrane. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 18, 2016, 9:56 AM
How to install it. With so many variation I am concerned in doing it proper. My TDS does not exceed 4 I try to keep it as low as possible for my 225 reef tank and worry about making any changes..but I see benefit from this product. If I sent you schematic of my system could some one send me schematic on proper hook up. Thanks Ron
Question by: Ron sorenson on Mar 7, 2016, 7:48 PM
Great question!
I have included a link below to our instruction videos. This will walk through the process. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 9, 2016, 6:34 PM
I saw somewhere on here that you shouldn't add this kit if you are using your ro/di for drinking water as well. I was wondering why?
Question by: DJ on Feb 7, 2016, 12:00 PM
Great question!
In short the second membrane has a negative impact on the pressurized tank and causes issues in the system and pressurized tank. In addition the second membrane is running off of the waste water of the first membrane and will inherently have a higher TDS. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 10, 2016, 6:34 PM
1. What is the reason for this upgrade not being recommended for a drinking water system?

2. I have the 5-stage 75 GPD drinking water unit, but do not use the spigot or water tank that came with the system. Would the recommendation to avoid using the 150 GPD upgrade for this drinking water system still be valid?
Question by: Zach Jones on Feb 7, 2016, 12:28 AM
Great question!
The water saver upgrade will cause issues with pressure on the tank and drinking water section. In addition the second membrane will have inherently higher TDS from running on the waste water of the first membrane. This would still effect your drinking water. As an alternative the single membrane may be switched to a 150 GPD membrane while also changing the flow restrictor to the correct size for a single 150 GPD restrictor.
Answer by: Connor on Feb 10, 2016, 6:52 PM
I don't have a BRS system at this time, but that shouldn't matter for the purpose of my question. I've got a 90 GPD 4 stage system, splitting off a pressurized drinking tank between the membrane and DI. I'm considering dropping to a 75GPD membrane and getting the BRS 150 GPD kit. First question, is it possible to "downgrade" my current membrane to the 75 GPD? Second question, why do you mention at the end of your description that this upgrade is not recommended with drinking water systems? Is it due to the increased membrane output TDS, or is there another reason?

Question by: Tim K on Feb 1, 2016, 9:44 PM
Hey there Tim!
Great question. It is certainly possible to switch from a 90 GPD membrane to a 75 GPD by switching the membrane (The housings are the same size) and switching the flow restrictor on the waste water line to our 75 gallon (550mL) flow restrictor. The reason the water saver upgrade is not recommended is there is an issue with actual water being saved when installed with a pressurized tank, The back pressure from the tank will cause the waste water ratio to remain the same as with a single membrane. So the water saving aspect of the membrane is neglected when used in conjunction with the tank. It will still function and even speed up the process of filling just not reduce the waste water. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 26, 2016, 7:43 AM
I have a 100 gpd RO/DI unit. I want to use the upgrade kit which is only for 75 gpd units. If I order the kit and purchase a separate membrane that has a rating of 100 gpd to go inside the casing, would this work? Also, would I need to flush the new membrane for one hour like I did for the original installation?
Thanks so much,
Shara Armstrong
Question by: Shara Armstrong on Jan 26, 2016, 11:31 AM
Great question!
You would need the kit plus the 100 GPD membrane. in addition the flow restrictor from your current units waste line will need to be moved to the waste water of the second membrane. The new membrane will need to be flushed as with the original. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 3, 2016, 1:31 PM
I'm really interested in this but this is what I've got. Tds out of tap is 380. Water psi is 57. Is there such a thing as a pre-filter before my ro/di? Am I going to need a booster pump togain 3 psi for this? Thanks
Question by: Shaun on Aug 1, 2014, 4:47 PM
Hi Shaun,
No booster pump would be necessary here. The only real concern would be the TDS levels. With the TDS that high you may see a noticeable difference in the rate of DI consumption after adding the unit. You will still get 0 TDS water out of the DI resin though, it just won't last as long.
Answer by: Bulk Reef Supply on Aug 1, 2014, 4:47 PM
My RO/DI unit has the membrane flush kit. will I have to remove that to install the upgrade?
Question by: Josh on Jul 30, 2014, 4:28 PM
Hi Josh,
You will not have to remove it. You will just move it like you would the flow restrictor on a normal unit and then it will function to flush both membranes.
Answer by: Bulk Reef Supply on Jul 30, 2014, 4:28 PM
The pressure gauge on my 5 stage plus reads between 60-70psi (varies based on time of day, and apparently, ambient temperature..go figure).

Anyway, is that gauge before or after the first membrane? I'm trying to figure out if I'll need to get a booster pump with this.
Question by: Dariush on Jul 21, 2014, 5:14 AM
Hi Dariush,
That is the acting pressure on the membrane (which will be the same between the last carbon block and the flow restrictor). No bosoter pump is needed :)
Answer by: Bulk Reef Supply on Jul 21, 2014, 5:14 AM
I'm sold on the need for this RO upgrade kit for my BRS 75 gal RO DI filter but my hesitation comes from plumbing in my membrane flush kit. I think I understand how membrane flush kit will be plumbed in, though not real clear on it. None of the videos seem to address this. Can you explain the hook-up for me? Thanks!
Question by: Bob on Jul 11, 2014, 4:36 AM
Hi Bob,
When you install the kit you move the whole waste water assembly to the new membrane housing. The flush kit and flow restrictor go along with the tube. If you have a flush kit it will continue to work and will flush both membranes. As far as installation goes, just follow the instructions as if it isn't there, it doesn't change the process any :)
Answer by: Bulk Reef Supply on Jul 11, 2014, 4:36 AM
Sir, I have a 100 gallon per day system Am I able to use the 150g per day water saver upgrade kit on it? It says in the overview its for a system that is 75gallons per day. so I wasnt sure. If so how many gallons a day would it be.
Thanks George
Question by: George on Jul 10, 2014, 8:57 AM
Hi George,
Unfortunately it has to be a 75gpd system because the membranes have to match. If used with a different sized membrane the flow restrictor would be a mismatch to one membrane or the other.
Answer by: Bulk Reef Supply on Jul 10, 2014, 8:57 AM
Will the 150 GPD water saver work with a 50 GPH RO system? I'm assuming if it does that it would bring the output down to 125 GPD.
Question by: Jeff on Jul 10, 2014, 7:17 AM
Hey Jeff,
Unfortunately it would not. The membranes need to be the same size otherwise the flow restrictor would be mismatched to one membrane or the other.
Answer by: Bulk Reef Supply on Jul 10, 2014, 7:17 AM
the install video dose not seem to be working. Can you send me some instruction on how to install this upgrade.
Thank you
Question by: Mike on Jun 9, 2014, 8:38 AM
Hey Mike,
Does this link to the installation video work for you?

Video is really the easiest way to do this but if your computer does not have the ability to play YouTube video's just let us know and we will get you figured out.
Answer by: Bulk Reef Supply on Jun 9, 2014, 8:38 AM
Hi, is this the upgrade kit for BRS 5 Stage RO/DI System - 75GPD which I purchased before. And is it really can cut down the amount of waste water by 50% as I have watched the video by Mr. Saltwater Tank??
Question by: Evan on Mar 22, 2014, 11:04 AM
Hi Evan,
That is true. Assuming you have enough water pressure (65psi) and water temp, the kit would allow you to produce twice as much product water for the same amount of waste water (ie, cut your waste water in half).
Answer by: Bulk Reef Supply on Mar 22, 2014, 11:04 AM
I have the BRS 5 STAGE PLUS RO/DI SYSTEM - 75GPD, will I need another flush kit if I do this upgrade?
Question by: Jason on Mar 21, 2014, 2:37 PM
Hi Jason,
Fortunately you will not. Both membranes operate off the same flow restrictor and thus only the existing flush kit is needed.
Answer by: Bulk Reef Supply on Mar 21, 2014, 2:37 PM
yes hi im not sure if my question is worth asking or not but i was just wondering if it would be better or defeating the purpose of the water saver RO add on.......wondering if it would be better to split the water line going into the first RO so it goes into both RO units then each have there own waste water discharge ? im just concerned that the waste water coming out of the add on RO unit and going into the second one is all bad water which to me seems like its going to make the second RO go bad a lot faster then the first? and also whats the best PSI to run the unit with the water saver add on, 65psi or is there a more optimum PSI and 65 psi is just the minimum? i get well over 150 psi coming out of my tap.
Question by: Tony on Mar 3, 2014, 6:50 PM
Hi Tony,
If you split the incoming water going going into the membranes then you basically just have two RO/DI units and would have double the amount of waste water. In that situation it would actually just be better to swap it out for a single 150gpd membrane because you would have lower replacement costs in the future.

Keep in mind that while the waste water feeding the second membrane is higher in TDS then the first membrane, because of the waste water ratio its really not that much of a difference. If for example you had 100TDS going into the first membrane, the waste water coming out and going into the second membrane would likely be around 120-130tds. Assuming the membranes get there normal 98% rejection rate, that means the first membrane would produce water at 2 tds and the second membrane would produce water at 2.6 tds (so the average total tds being 2.3. As you can see, not much of a difference.

The reason we only suggest this unit for systems with relativly low TDS to begin with though is that this effect is amplified the higher the TDS, at 500 tds your actually getting into the range of a few TDS instead of fractions of a single TDS, though even at 500 TDS your looking at 10 out of the first membrane, ~12 out of the second for an average of 11 (and a difference of 1).

RO membranes run better at higher pressures though you shouldn't exceed the 80psi maximum on the unit itself. I would double check the number on the incoming water pressure though as the 150 might have been a different unit of measurement then PSI. Its certainly not impossible to see numbers that high in some areas but 150psi is into exploding pex, toilet, refrigerator, and washing machine territory :-) In fact I think plumbing code in most places is 80psi maximum or your required to have a pressure regulator (may be different in your area though).
Answer by: Bulk Reef Supply on Mar 3, 2014, 6:50 PM
Will the membrane flush kit effectively flush both membranes when used with this upgrade? Also is it still possible to use a DI bypass valve?
Question by: Mark P on Jan 13, 2014, 3:02 AM
Hi Mark,
It sure would. It also wouldn't make any difference to whether you choose to bypass the DI (or just disconnect the DI altogether).
Answer by: Bulk Reef Supply on Jan 13, 2014, 3:02 AM
Does this kit come with a flow restrictor?
If not would I need the 75 gpd or the 150 gpd flow restrictor.
Question by: Glenn on Nov 11, 2013, 8:42 AM
Hi Glenn,
It does not but you actually don't want to switch your floor restrictor. You want to stick with the same 75gpd restrictor you have.
Answer by: Bulk Reef Supply on Nov 11, 2013, 8:42 AM
Could I use this for my 5 stage deluxe, with the drinking add on? I use my 5 stage for both my reef tank and to supply water to my fridge.
Question by: Derrick on Oct 20, 2013, 8:22 AM
Hey Derrick,
With the drinking water add-on you will have a lot more back pressure which would make the dual system a lot less efficient. If your goal is to reduce waste water you would likely be better served by a permeate pump. The permeate pump uses the pressure from your waste water to reduce the effect of the storage tanks back pressure. This will make your existing membrane more efficient and allow you to get more pressure in the tank as well. Its compatible with systems up to 100gpd.
Answer by: Bulk Reef Supply on Oct 20, 2013, 8:22 AM
I have the BRS 5 STAGE PLUS RO/DI SYSTEM - 75GPD My water pressure gauge is reading 43lbs, In your viedo you say that i need 65 lbs going in to the unit . Was wondering if the 43 lbs is enough pressure for the BRS 150 GPD Water Saver Upgrade Kit to work. I am not really sure where the gauge is at on the BRS 5 STAGE PLUS RO/DI SYSTEM - 75GPD I am guessing that it is after all the membranes to be able to tell when they need change. Can you please let me know if you think this will work or will I have to get a booster pump? Thank You Michael
Question by: Michael on Oct 2, 2013, 4:26 PM
Hi Michael,
The 150gpd water saving upgrade kit requires 65psi. If your unit only has 43psi then you would need to increase the pressure to 65psi to add the kit so a booster pump would be necessary.
Answer by: Bulk Reef Supply on Oct 2, 2013, 4:26 PM
I was wondering which is better for water quality and less waste water, the 150gpd upgrade kit, or the 150gpd membrane by itself? Also, if I add the auto flushing valve, do I use the one for a 150gpd membrane, or the one for 75gpd membrane on this kit? Thank you.
Question by: Paul on Oct 1, 2013, 6:43 PM
Hey Paul,
It depends on what your main goal is. The 150gpd upgrade kit is better for waste water but will technically create slightly worse quality of water (though unless you have very high TDS to begin with it would be unmeasurable difference to most). If you do have high TDS though we wouldn't recommend the 150gpd upgrade kit.

For an auto flush valve/flow restrictor you would want the proper size for the membrane(s). If you use the 150gpd membrane you want the 150gpd size, if you are using 75gpd membrane(s) then you would want the the 75gpd size.
Answer by: Bulk Reef Supply on Oct 1, 2013, 6:43 PM
I've read that if you cut down you waste water you will blows thigh RO filters as well as DI filter faster. If there any truth to this? I live the speed and my last water is so much lower. Just not sure I want to blow though the filters if there is any truth to this..

Question by: Robb and Trudi on Sep 17, 2013, 11:55 AM
Hey Robb,
Its true that artificially restricting the amount of waste water (which is really flush water) a membrane receives will likely reduce the membrane lifespan and increase the TDS of the out-coming water which will decrease the lifespan of the DI resin as well, though it shouldn't have any sort of negative effect on the prefilters themselves.

Its important to note that this is NOT how the 150gpd upgrade kit works though. The 150gpd upgrade kit adds a second membrane to reprocess the waste water of the first membrane. With the kit each membrane actually continues to get the minimum amount of flush water (actually one of them even gets extra flush water).
Answer by: Bulk Reef Supply on Sep 17, 2013, 11:55 AM