Membrane Solutions 50 GPD RO Membrane 1.75"x11.75" Standard Reverse Osmosis Membrane Filter Replacement for Kitchen Under Sink RO System and Aquarium Reef Tank, ROULP-1812-50 (2-Pack)

They only last about 3 months then the water flow slows significantly. Although they are much cheaper than the hydro-logic 300 RO replacements. I’ve used both and the life on them are exactly the same. This garbage that the water is dirty and that’s the reason of its short life is simply not true. The manufacturers on both membranes replacement systems just like overselling there products. If there is truly a Warrenty for there life, I would challenge all of it!

I didn’t realize how old my RO filters were. Checked the TDS at around 100 after filtration and ~325 before. I thought this was fine. Got an ad for these replacements and thought it was probably time to do it but I didn’t expect a change. I was wrong - TDS between 8-12 after the swap and the flow rate was noticeably faster.

I run a pair of 50 GPD RO membranes in parallel in a modified Watts Zero Waste system. I used other budget membranes before but they didn't last very long before restricting the flow to the point my pump broke. I used Watts membranes for about a year and they still flowed well but the TDS readings started to creep up to around 18. Just put these in and they started out with about 300 TDS which is normal. I ran 5 gallons though them and the TDS fell down to 6 on one and 8 on the other. So far so good.

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.

No problem with install. seems to work good, just like the one it replaced

worked perfectly for my R.O.

270ppm input water with 3 pre filters before and they went from producing 480ml per minute at 80psi and 75 degree water down to 230ml per minute in less then 108 gallons of RO. Maybe i got defective membranes or maybe theyre junk either way Not good. Hopefully the company will stand behind theyre product and water production claim and i will update review with results. So far not a good start. The actual hydrologic membranes lasted over 8000 gallons before theyre was even a slight 6% reduction in production volume.

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.