I have a 6 stage RO/DI from, Titan Water Pro, that I no longer need. It also has an inline TDS meter and BRS dual canister DI. I have emptied, cleaned, and replaced all of the filters (NOT membranes). You will need new DI resin to get to 0 TDS, but otherwise the membranes still seem to be doing their jobs nicely. Asking $225. More than $400 invested.
