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I've been using the TFP PoolMath on this sight. Yesterday I stumbled upon poolcalculator.com, which appears to be the same calculator. Except with the same raw numbers plugged in, PoolMath is telling me my shock level is 31, while poolcalculator.com calculates 21. Pretty big difference for what...

Crystal clear water yesterday. pH was 7.2 and wanted to raise it. Added soda ash, possibly a bit too much. Water got cloudy immediately and did not clear up overnight or yet today with pump running. Current test numbers: FC: 6.5 CC: 0.5 pH: 7.8-8.2 (somewhere in the middle) CH: 275 TA: 90 CYA...

Just bought a house with an inground vinyl pool, approx 33,000 gallons, previous owner used chlorine tablets, water looks clear. Found this sight, started reading, ordered the TF-100, and results are: FC: 10 CC: .5 TC: 10.5 pH: below the lowest color, so <6.8 CH: 300 CYA: 95 1) So my 4 kids...