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

99% Recommend this to a friend (74 of 75)

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 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
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
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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  • 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.
  • It just works! By don_chuwish on 9/15/2015

    Be sure to have some needle nose pliars with you to pull out the old membrane - bare hands just won't work.
  • Great product By Jim on 6/13/2015

    Best replacement RO filter at great price
  • The Best By JB on 5/17/2015

    Great product at a great price.
  • I use these all the time. By Lacy on 4/13/2015

    These are the best filters and the price is right. Filters everything out.
  • Clean Water By Brian on 3/30/2015

    Clean water with a lower price. You can't beat it.
  • Easy replacement Great Part Great Service By Jack on 3/9/2015

    Easy replacement Great Part Great Service
  • Does the job, easy to install By Mr. Microscope on 1/26/2015

    After three years with my RODI unit doing the job, I decided it was time for a refresh on the RO membrane (in addition to my yearly update on the rest of the unit (filter, carbon blocks, DI resin)). I received my RO membrane and was like, "...uh, what now?" I quickly found this article from BRS explaining every aspect of replacing the unit with all sorts of tips for getting the job done.
    Just a few minutes later, I had it installed and was running water though it. Thanks for the write-up BRS! Great product.
  • Best membranes on the market By chromiumlux on 1/19/2015

    I have used these membranes from day one and will continue to use them.
  • CLEAN WATER By Mark on 1/14/2015

    wasn't sure this would fit since i had got my rodi unit at another site. Well if DID and the new membrane i feel works even better, was easy to change, and a great value and allowed me to order other items at once from same site.....bulk reef supply is really a one stop shop for reef keeping..
  • Excellent fit and finish By Sympley on 1/13/2015

    So far so good. I was going through DI cartridges at a rate of 1 per week. It was time to replace the membrane. This one seems very well build and good quality.
  • Price! By Tim on 1/8/2015

    My local store charges almost 3 times as much as BRS. BRS has great service, great price!

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