2 Faucet Water Filter Good Enough for Untreated Water Changes

Aug 3, 2007
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#1
I have 1 main water filter that filter all of the impurities in the water plus chlorine and chloramine. I have one other faucet filter that filters out what the main filter didn't get. Would I still have to use a water conditioner every single time I do partial water changes to filter out the impurites the 2 filters didn't fill out?