1. How often do you have to replace your RO/DI filters?
2. What's the biggest factors that come into play in exhausting your RO/DI filters?
3. How high is your home TDS?
1. I just got my 100GPD RO/DI system from the Marine Depot liquidation sale... so I've only had it a couple weeks, so no idea how long before I will need to change out the filters yet.
2. see above
3. 95 TDS (measured today)
I have the triple in-line TDS meter. #1 measures my tap, #2 measures TDS out of the RO and #3 measures TDS out of the DI (final stage).
So knowing the TAP TDS and the TDS out of the RO, I can tell what the rejection rate is and will replace when it drops below what I find acceptable. I wll change my DI resin when I get anything other than 0 TDS out of it. I bought several sets of filters during the MD sale while they were cheap, so I should be set for a while.
Really enjoying making my own RODI water now. sure as heck beats lugging water from Walmart or the LFS.