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Dry ice would definitely lower the pH. You are essentially creating carbonic acid (the same stuff found in acid rain, which is why acid rain is blamed on excessive emissions). It's a relatively weak acid, so it's probably akin to using vinegar to clean up scaling around the pool, though...

I was thinking of trying this stuff too. My pool refuses to give up the slight green tint, so I figure if I dye the water (which is chemically just fine) it should stop looking "dirty". And we're having a party in a few weeks and it would be something fun to talk about. I'm definitely...