I know others have had better success with these units. I can tell you my experience. I bought a similar unit on ebay and had difficulties. The RO membrane didn't sit right in the socket so water was bypassing the membrane. I kept getting TDS of ~10. I wrapped the membrane end with teflon tape and got it down to ~3 but never 0. I may end up adding another DI chamber to try to get it down to 0. In other words, you kinda get what you pay for.
I have a water general ro/di and it has worked flawless for the last 14 months. I am on my second set of filters (same ro membrane ) I took the last carbon filter off and replaced it with another di cartridge and I have 0 ppm from an incoming of 125 to140 ppm depending on time of year. I use it to top off my sump and runs 24/7 as needed. I have no complaints with it.
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