150 GPD Reverse Osmosis Membrane, NSF/ANSI 58 Certified | 12"x2" RO Membrane Replacement For Under sink Water Purifier, Aquarium Reef and Maple Syrup DIY RO 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