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How important is it to raise/maintain target total hardness level with a vinyl pool? does the hardness level affect other levels (CL, PH, TA, CYA etc)?

got the TF 100 kit this week- declaring independence from pool store! Here are my first results: FC 3.5 CC 0 PH 7.5 TA 160 CYA 100 water temp 88 started using bleach 2 weeks ago, no more pucks in feeder! I know the TA is on the high side- trying to bring it down gradually w/ sod. bisulfate...