75 GPD Reverse Osmosis Membrane - Dow Filmtec

75 GPD Reverse Osmosis Membrane - Dow Filmtec
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75 GPD Reverse Osmosis Membrane - Dow Filmtec

94% Recommend this to a friend (81 of 86)

SKU: 200051
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Quick Overview

Why does BRS recommend this?

Dow 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 DOW membrane is hands down the best membrane for our hobby.


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


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Product Questions

What is the optimal psi to run this membrane
Question by: Daniel Howard on Jun 27, 2016 9:50:00 AM
Great question!
The optimal PSI is between 50 and 65 for a single 75 GPD membrane. Higher will more less rejection and slightly shorter life span and lower will mean more rejection. Feel free to let us know if you have any further questions.
Answer by: Connor (Admin) on Jun 28, 2016 6:42:00 PM
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 9:44:00 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 (Admin) on Apr 14, 2016 10:31:00 AM
what is the difference between this membrane and a hi-silicate removal TFC membrane?
Question by: Wendell on Jan 26, 2016 7:59:00 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 (Admin) on Feb 3, 2016 1:29:00 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 1:55:00 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 (Admin) on Jul 18, 2016 7:26:00 AM
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 8:03:00 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 (Admin) on Apr 5, 2016 5:20:00 PM
Can this work with Corallife products, such as the pure flo-II?
Question by: Miles on Apr 1, 2014 4:47:00 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 4:47:00 PM
At what tds should the ro membrane be putting out before the di resin?
Question by: ryan on Feb 5, 2016 12:17:00 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 (Admin) on Mar 2, 2016 11:43:00 AM
Will this unit work in an ro buddy system
Question by: Steve on Mar 28, 2016 10:51:00 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 (Admin) on Mar 29, 2016 11:45:00 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 6:40:00 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 (Admin) on Apr 13, 2016 5:56:00 PM
How long (as in how soon)do we need to change the filter inside on the membrane?
Question by: Dong on May 2, 2014 11:35:00 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 11:35:00 AM
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 3:56:00 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 3:56:00 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 7:53:00 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 7:53:00 AM
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 5:12:00 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 5:12:00 PM

Full Details

75 GPD MEMBRANE (99% REJECTION RATE) Hands down the best membrane for our hobby.


Compatible with all RO systems


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


1. Permeate flow and salt rejection based on the following test conditions: 250 ppm softened tap water, 77°F (25°C), 50 psi (3.4 bar), and 15% recovery.
2. Permeate flow rates for individual elements may vary +/-20%.



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  • Good quality and does the job By Trailjammer on 10/12/2016

    Easy to install. The original in the BRS Stage 4 kit has lasted for years. So we will see how long this one lasts.
  • Performs well By Christopher on 9/8/2016

    Drops supply water from approximately 150ppm to 3ppm for a solid 18 months. Got 2 years from the same membrane that came with the BRS RO/DI kit but only 18 months from the last 2 replacements. No change in supply water quality and I use the membrane flush kit regularly.
  • Don't use with Spectrapure MaxCap 90 By John on 8/29/2016

    Tried this with my Spectrapure MaxCap 90. Was getting about 30 GPD. Tried different restrictors, including a ball valve to adjust flow to any level. The most I could get was about 75ml per minute which is 28.5G in 24 hours. BRS tech advice was to try their 550ml restrictor barrel but no guarantees. Not sure how it could get from 30 gpd to 75 gpd. If you try and it produces 75 gpd let me know. It could have been a bad membrane but the tech didn't think so. 2 stars because maybe it actually produces 75 gpd with the BRS RODI kit. It just doesn't do it with the Spectrapure.
  • Easy to change By MaLi on 8/14/2016

    I changed my membrane for the first time last night, it only took a few minutes. The BRS guide was extremely helpful and made changing it out even easier.
  • RO Membrane By Chuck on 8/5/2016

    its always a good idea to replace with the rest of the filters
  • Awesome membrane By Mopar1187 on 7/20/2016

    Awesome product wouldn't expect anything less from best. Always been my good to place..
  • Great product By Gary on 7/1/2016

    Great product at a great price.
  • Excellent! By Schwaggs on 4/18/2016

    I replaced my tired RO membrane with this one and am very happy! Output and water quality is great! Made 500 gallons with is recently and the output water from this membrane was so clean, it didn't even consume a single DI resin cartridge!
  • Best bang for buck By Pat on 3/23/2016

    It is the cheapest place to get a RO membrane for the price. If it's labeled for aquarium use they're usually twice the price but the price at BRS is even cheaper than the membranes at my local water purification store
  • perfect membrane, great price! By Rey on 3/17/2016

    Great price, free shipping and on a quality product, thx BRS!
  • Great product By adam on 2/16/2016

    Great product at a great price! way to go BRS!
  • Great membrane By Hector on 11/10/2015

    Yes I will recommend this product this is my 2nd menbrane I own no problem great results & ease to install.