Dow Chemical

75 GPD Reverse Osmosis Membrane - Dow Filmtec

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Why does BRS recommend this?

DuPont is a leader when it comes to water treatment and filtration.  Their 75 GPD membrane has a 99% rejection ratio, and most other membranes cannot make that same claim. Along with meeting NSF/ANSI standards the 75 GPD DuPont (formerly Dow Chemical) membrane is hands down the best membrane for our hobby.

Up to 99% rejection Dow membrane* - NSF certified NSF Certified

Compatible with all 10" RO Membrane Housings. Be sure to change the flow restrictor if you change the flow of your membrane.


FILMTEC reverse osmosis membrane elements for home drinking water are the industry's most reliable. Advanced membrane technology and automated fabrication allow these elements to deliver consistent performance that equipment suppliers, water treatment dealers, and residential customers can rely on. FILMTEC elements are shipped dry for convenient handling and long shelf-life. These elements are NSF/ANSI Standard 58 listed. Equipment suppliers can take advantage of FilmTec's Standard 58 listing and participation in the NSF Data Transfer Protocol to reduce costs for reduction claims for their systems.

  • Rated at 50 psi
  • Will purify about 20% more water than competitive elements rated at 60 psi


*DuPont 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%

For more info on DuPont Filmtec BW60-1812-75 Membrane - Click Here


Membrane Replacement Instructions

More Information
UPC 826333000063
Membrane GPD 75
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Product Questions

This only lasted 6 months. My tap TDS is around 130 and after 6 months I am getting 53 after the membrane. Is it possible the membrane container is bad and letting water around the membrane? If so, do you sell the container? The one I have was from another kit. I would like to get the most from the membrane
Question by: Shawn Holman on Apr 5, 2020, 6:31 PM
Hi Shawn,

There are many reasons why you might see poor performance from an RO membrane. It can be as simple as a seasonable drop in water pressure or temperature. Other seasonal fluctuations like the amount and type of disinfectant used by your municipal water treatment facility (chlorine vs chloramine) can also be an issue. Both chlorine and chloramine can degrade a membrane so if your carbon block(s) are exhausted and allowing them through it can lead to a drop in performance. Free and total chlorine test strips are a great way of monitoring the performance of your carbon blocks.

We recommend using the Universal carbon blocks due to their increased capacity and ability to treat chloramines provided you use two of them.

It is possible that the membrane housing is the issue but the gasket on the membrane its self is a more common problem. You can try removing and reseating the membrane to ensure there is a good seal there.

Once you have ruled out these other potential issues you can try a new housing but based on experience it is an unlikely the source of your issue.

I hope this helps! Please let us know if you have any further questions.
Answer by: Nick on Apr 8, 2020, 5:17 PM
It is that time to replace my APEC drinking water RO membrane. My current membrane has been in operation for 4 years now, but still get 012 ppm per TDS monitor. APEC wants $75 for their membrane, and on their website it is illustrated as this membrane. I have an RO-90 (apparently it produces 90gpd), not that I need that much. This will be going on a system that produces drinking water. Any reason this membrane would not work for my application? Thank you.
Question by: Brandon Hestwood on Sep 28, 2019, 7:10 AM
Hey there-Our 75gpd membranes should work in those systems as long as they utilize 2.5" x 10" filters (which is pretty standard in the industry). One thing you will have to change though is the flow restrictor to a 550mL/min restrictor if this is not what is already included in the unit: https://www.bulkreefsupply.com/membrane-flush-valve.html Take care!
Answer by: Brad Ohmann on Sep 29, 2019, 9:40 AM
Why is this 75 GPD membrane the BRS "Recommended" membrane as opposed to the "Best Seller" 100 GPD membrane that's also a Dow Filmtec? I'm just curious since I usually try to stick with BRS recommended products. You guys have never steered me wrong!
Question by: Justin Cook on Apr 28, 2019, 1:15 PM
Hey there-

Great question! This is our recommended option as it provides a slightly higher rejection rate for better performance, however many people choose the extra water production making the 100gpd the most popular. If you have any other questions don't hesitate to ask. Take care!
Answer by: Brad Ohmann on Apr 28, 2019, 2:00 PM
What is the maximum time an RO/DI system be idle until the RO membrane gets damaged?
Question by: Mark on Jun 2, 2017, 7:40 PM
I'm afraid that's a bit hard to answer definitively as it can vary based upon your water quality and bacterial load in the water, but the longer it sits with stagnant water, the more time bacteria have to colonize and break down the membrane material. We don't generally recommend letting the unit sit stagnant for more than a couple weeks, and weekly operation is best.

Have a great day!
Answer by: Zack on Jun 8, 2017, 4:58 PM
How long do I need to run the new membrane before I can use the water. The Dow document in the link says rinse for 24 hours. It also says fill and drain tank once. I have a 100 gallon storage tank. What if someone only has a 10 gallon storage tank? Instructions are confusing.
Question by: Ken Onulak on May 20, 2017, 4:12 PM
Hey there,
Generally it's recommended to flush the first 10 gallons or so as this initial product water contains higher TDS water due to the preservatives on the membrane and the re-hydration period. After this, it's considered to be fine to start collecting water for use. The information on 24 hour operation pertains to reaching full membrane hydration and optimal performance, however the water can be collected before this time. Usually you can expect to reach above 80% of max performance within a few hours of operation.

Hope this helps!
Answer by: Zack on May 22, 2017, 6:45 PM
How long can you store a brand new unused sealed membrane? How should it be stored if unused and still sealed?
Question by: Leon on Jul 15, 2016, 1:55 PM
Hi Leon,
A new membrane can be stored for quite a bit of time. The manufacturer puts a preservative on the surface of the membrane which can keep good for quite some time (2+ years). That is they recommend discarding any water produced for the first hour or two when it is first installed. Storage for the membrane should be kept in a cool dry place with a steady temperature.
Answer by: Charlie on Jul 18, 2016, 7:26 AM
How often should these be changed im going on a year today with an imput water source of 237 TDS and almost 60psi? would it be yearly? also these are on BRS 4 STAGE VALUE WATER SAVER PLUS RO/DI SYSTEM - 150GPD upgraded to 6 stage
Question by: Joshua Hansen on Apr 10, 2016, 9:44 PM
Great question!
Ideally the membrane will last around 2 years. You will be able to see with a TDS meter on the IN section. The ro should reduce around 99% (with a single membrane) and bring your TDS on the In to around 0-10. If on the single membrane it is higher than 10 after running the unit you will want to consider a replacement. With the water saver version dual membrane the IN TDS will be a little bit higher closer to 5-15 TDS. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 14, 2016, 10:31 AM
What is the maximum psi this membrane can operate at? -Specifically for flushing. Feel free to let me know if you have any further questions. Thank you.
Question by: Join the Revolution on Apr 8, 2016, 6:40 PM
Great question!
These membranes are recommended for 50-75 PSI the maximum mount we typically see during flushing is 80 with no negative effect. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 13, 2016, 5:56 PM
I have a water softener on my water system. Will this or the salt from the softener plug up the membrane? I've been told I had to bypass the softener or it would plug up the membrane.
Question by: mike on Apr 2, 2016, 8:03 AM
Great question!
We have found using the system after Water Softener will improve the life of the unit and membrane. This will not cause the unit to clog any faster than normal. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 5, 2016, 5:20 PM
Will this unit work in an ro buddy system
Question by: Steve on Mar 28, 2016, 10:51 AM
Great question!
Most membranes will be a universal physical size and work in all units. You will need to make sure the GPD rating is the same. If they are not the same you will need to change the flow restrictor on the waste water line to a 75 GPD flow restrictor. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 29, 2016, 11:45 AM
At what tds should the ro membrane be putting out before the di resin?
Question by: ryan on Feb 5, 2016, 12:17 AM
Great question!
The RO membrane will remove around 97-90% of the TDS for a good range after flushing this should be typically between 000-010 however it can be higher with poor source water quality. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 2, 2016, 11:43 AM
what is the difference between this membrane and a hi-silicate removal TFC membrane?
Question by: Wendell on Jan 26, 2016, 7:59 AM
Great question!
Overall they will function on the same process of TFC however certain membrane which are High Silica can last longer due to the negative effect of silica. The difference between the membrane is not that one will remove more or less rather the life span of the membrane for a specific application. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 3, 2016, 1:29 PM
I have this 75gmd membrane in in my unit and keep it at 50 psi coming in. My city water psi is 80. I was told that if I were to open the valve up (incoming water to the 80 psi instead of the 50psi I am regulating now that I would get more efficientcy? Should I keep that water at 50 psi or 80psi? Going into the rodi unit.Thanks
Question by: Tom Syswerda on May 6, 2014, 7:53 AM
Hi Tom,
The unit can handle up to 80psi without issue and it does perform better at higher water pressure. I would go ahead and run it at the 80psi, there isn't any reason not to and performance will only go up.
Answer by: Bulk Reef Supply on May 6, 2014, 7:53 AM
How long (as in how soon)do we need to change the filter inside on the membrane?
Question by: Dong on May 2, 2014, 11:35 AM
Hi Dong,
The membranes last quite a long time, typically 3-5 years though if you treat them well (vigilant on changing your pre-filters on time, etc) they can last even longer.
Answer by: Bulk Reef Supply on May 2, 2014, 11:35 AM
Can this work with Corallife products, such as the pure flo-II?
Question by: Miles on Apr 1, 2014, 4:47 PM
Hi Miles,
Membranes are a standard size so they will fit in any unit. Just make sure that if you change the speed of the membrane you also change the size of your flow restrictor to match.
Answer by: Bulk Reef Supply on Apr 1, 2014, 4:47 PM
I have purchased a 75g 5stage plus rodi 6mths ago and wanted to know how long should the membrane and di resin last. From the first time I used it my tds coming in to the di chamber starts around 120 for afew minutes then gets down to 10. Comes out to 0 going out of the di chamber. Does this sound about right or do I need to change the membrane. I've change the sediment filter also. Thanks.
Question by: Linh on Oct 25, 2013, 3:56 PM
Hi Linh,
That sounds pretty typical. It is higher at first because of tds creep and will lower as it runs. Non-exhausted DI resin should give you 0 TDS coming out. The membrane itself will typically last 3-5 years, sometimes even much longer. DI resin doesn't really have a "normal" as it is completely dependent on your source water. Monitor the TDS and when it begins to go above 0 then it is time to change the resin. We use a color changing DI resin so this should also coincide with the resin turning from a dark blue/black color to a gold/yellow color.
Answer by: Bulk Reef Supply on Oct 25, 2013, 3:56 PM
What were to happen if you put a membrane at a different rate than the unit is mark at? For example, putting this 75gpd into a 50gpd RODI unit or putting a 90gpd membrane into a 75gpd unit? They all seem like the same plastic enclosures. Does the membrane just really dictate the GPD output?
Question by: BJ on Sep 4, 2013, 5:12 PM
Hey BJ,
If you change the size of the membrane without changing the flow restrictor to the proper size your unit will have the incorrect amount of waste water. It will either have too little water which would damage the membrane or too much water, which is just a waste of water (and could decrease pressure). The housings for the membranes themselves are universal. The membrane is what changes the output, though there are some other factors such as water pressure and temperature that do as well.
Answer by: Bulk Reef Supply on Sep 4, 2013, 5:12 PM