BW-4040, 4 x 40 RO Membrane for Desalination of Brackish Water, BW 4040 Reverse Osmosis Membrane for Whole House, Municipal water, NSF Certified, 99.5% Desalination Rate, 2400 GPD

Works great, perfect fit!

I stumbled upon this brand a few years ago after ordering multiple membranes for an RO/DI setup to produce 0ppm water. I had the same model membrane in use for around 2 years. This is for a car wash setup and I don't hold back on producing 0 ppm water for every aspect of the wash process for multiple vehicles. I received this new one to replace the old one, immediately could read the water in at 220ppm, the water out at the membrane was 14ppm. Perfect to keep my DI healthy and only pulling it down to 0ppm from 14. I did notice some changes in tape used on the new filter (appears to be lesser quality than previous). And they include a coupling now if you're hooking up to multiple in series? Either way, I'm happy and will continue to use this one in the future.

Before I even received my membrane, the seller contacted me to inform me that they would be more than happy to replace or refund for any reason once I received it. First thing I’ve ever ordered on Amazon and received a return guarantee for an item even if used. Also, the price and value of the product is very good. For just $120, you get a filter that compares with any local product that could cost twice the amount. I am using it in an RO DI window cleaner water purifier. I use a sediment and carbon filter before running into the RO filter. Then, the clean water goes into a DI tank. Out of that comes pure water with a TDS of 0ppm. I highly recommend the product because of the price, value, and awesome customer service.

This product is a great value for the price. It is not the most expensive out there, but it performs just as well as some of the more expensive models. I am always on a budget so this is definitely a good option.

Perfect fit for my full house RO system.After flushing out my system after installing. It was obvious that the water was being cleaned immediately!

Piece of garbage / I bought three and they lasted less than 2 months and lost 90% of Filtering capabilities in two days…completely collapsed

Only 10 ppm on clean water side

No problems worked great