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Mix equal parts pool water and distilled water(or any water that's unchlorinated). A reading of three will actually be six with this diluted sample. Two parts unchlorinated water to one part pool water will triple the reading.

We've all got some pretty strange and inconsistent advice from pool stores but what about things we came up with on our own before coming to this site? In my deepest despair, usually towards the end of the season, I would start to think that proper pool care was a black art like Voodoo...

Never could have done it without you.