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My Tank Thread
Following. I burn through a cartridge refill after about 60 gallons of useable water (BRS color changing). Have a bulk order of non-color changing resin coming today the reviews say that it lasts longer. Will let you know.
I'm going to guess you're on well water. Even the worst resin in the world should produce more than 60 gallons....and I would not rely on color change for when to change....rely on TDS numbers. Anyway, it's typical for wells to put out high carbon dioxide that will eat up your DI resin very quickly. There is a simply pH test to see if CO2 is an issue. Let your faucet run for a couple minutes and then fill a glass of water and immediately measure pH. Let the glass sit over night and measure pH the next day. If you see the water go for acidic to more neutral, you have a CO2 issue.