As so much good advice has been available on this forum, I thought I would ask about my small reverse osmosis system, RO-45 from APEC water. I've had it six years, so this year's filter replacement will include the RO membrane. Inlet water after the softener measures 230 PPM, after the RO it measures 50 PPM using a cheap TDS meter. My understanding was the product water should be no more than 5 - 10% of the feedwater, or it is an indication of a problem.
I was thinking of buying a permeate pump to upgrade this system during the filter change. Looking at the different systems on this page, can I just buy the RO-90 filters and plumb in a permeate pump? Or is the RO-90 membrane cartridge larger and won't fit?
My understanding is the permeate pump can improve waste water efficiency and product water generation performance? Lately my RO has been trickling water down the drain when it shoudn't be.