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    New-to-me pool... >100ppm CYA / 25ppm Free Chlorine... safe to swim?

    Hey, thanks so much for the great website! I just bought a house with a small in-ground screened-in pool, and I'm an absolute newbie. I estimate the pool to be around 7500 Gal (12' x 20' with an depth sloping from 3' to 5'6"). It was a bit dirty when we moved in, so I bought a new vacuum and...