Membrane Solutions 150 GPD RO Membrane, Reverse Osmosis Membrane, RO Membrane Replacement, Reverse Osmosis Filter Replacement for Under Sink Home Drinking RO Water Purifier System (2 PACK)

It's been seven years, and the membrane is still working great. We have 170 ppm in the pipelines, and 3 ppm at the filter outlet. I had to add a booster pump because the pipelines are at 40-45 psi. This membrane works best at 90 psi, where I achieve 3 ppm.

Good

I have used one of these membranes for years. Reliable and eager filtration providing my R.O. system with lots of great tasting healthy water. The two-fer deal lets me keep one on standby as a spare.

Easy to install, exact fit for my RO unit. Works as advertised, removing just about any contaminants from my source water. I have very accurate water quality testers and these bring my TDS, EC, and PPM's to 0. Once that number starts to increase past 15ppm's I change the filters out, which for me is around 6 months of about 20-25gallons a week.

Great filters. High flow rate, very good quality. Wish they make them in a 3 pack.

I made a RO unit for maple sap using the Hydrologic Stealth 300 and it took the sap from 2.1% to 3% sugar with one pass. I replaced the membranes from a local store to get me started this past spring at $80 a pop! Since we doubled the number of taps we needed to increase the efficiency of the RO unit and I added 5 pairs of 150 membranes and housing to the unit in series and now can take the sap in one pass from 2.5% to 4.5% sugar. But the real difference is in the "pure" water which isn't as we learned last year when my wife used it in the iron (yes it was a mess). The Stealth 150s let 0.50% sugar through where these units let only 0.15% which for us means less sugar wasted and more syrup (about 3 gallons more per 1000 gallons of sap)! This also means the water is more pure than before, and at 1/4 the cost.

I use this product to provide purified low salt content water to my carnivorous plants. I also drink it too and make my coffee with it. Once installed and after a brief run time where product water is not used, water reached a low 5 ppm from feed water of about 350’ppm TDS. When I shut the system off, recovery time for the next batch of water to reach that spec is less than 5 minutes! Past modules could take up to an hour. Also, membranes are shipped dry without a liquid preservative which has to be leached out of the system. I think that prolonged storage under wet conditions degraded the modules. I will no longer purchase these types of modules. Thanks for an excellelent product and the 2 pack should assure an ample supply of pure water. One thing I would like to know is where are they are manufactured as I am concerned about supply chain security issues and carbon path to get the product to me.

The RO filters were as described and arrived promptly