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If your FC and TC are at normal levels, is it still necessary to treat the pool with Non-chlorine shock every week or after heavy usage and rain? I have not been doing this and am finding that I have to raise my pH almost weekly. Would non-chlorine shock help keep the pH at a normal level?

Hi, I have a blue substance on my filter when I take it out to clean it. The pool chemicals are all in balance. I have an automatic cholorinator that has a blueish color plastic tube that holds the chlorine tablets in the chlorinator. Any chance it could be from that? I also have a pool heater...

Hi, I just received my awesome new chemistry set, a.k.a. pool testing kit. Everything looks good except my pH is a little on the low side with a reading of 6.8. I have come up with a similar reading in the past using test strips, and used the pool calculator to determine how much borax to add...