OmnipureQ5605, (2) Q5633, and Membrane Replacement Sediment Carbon Filter Cartridge Set w/ 36 GPD Membrane for Purotwist 4000

We just purchased a new water softener but they would not change the R/O cartridges since the system wasn't theirs. We purchased the Omnipure cartridges and I looked up how to install them on youtube. It was easy and now we have our great-tasting R/O water back!

Easy to install

Membrane filter looked like it's been laying around in warehouse somewhere for awhile. Outside dirty and scuffed but undamaged

Easy to install in my RO.

The membrane filter in this set is known to have a defective shut off valve. After installing all four cartridges in the correct order the membrane filter was draining almost all the water to the waste drain therefore not allowing the tank to fill. I contacted EPS who makes the other three filters and R/O system and they informed me that there has been a known problem with the shut-off valve in the Good membrane cartridge. They have tested all their stock and have returned defected cartridges to the manufacturer. The way it is supposed to work is that when the tank fills with water the membrane should shut off and return any residual water to the drain. Defective valves never open diverting input water to the drain. This seller should know about this problem and cull defective cartridges from their stock. I ended-up re-installing my original membrane cartridge and the system works fine. Did not want to bother returning all wet cartridges to possibly get another bad membrane. Before you buy this set ask the seller about this problem. FYI, most membrane filters never need to be replaced as carbons filters.

Okay doke.

had trouble with water quality at first but with flushing, it got better. Seal was poor on one filter. Omnipure sent replacement o-rings to fix

Arrived ahead of schedule. Exactly what I needed.