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I came across HTH Super Shock at Costco. They’re granules but cal hypo and don’t contain CYA. Are those safe to use or does anyone have any experience with it?

I’m draining my pebbletec pool completely and have black onyx finish. I think it would lighten up after drying but the amount of white that’s showing is making me worry that if they are calcium deposits. Any ideas??

Hello, i am new to TFP. 4 year old pool owner in south TX. I have few patches of calcium deposit on my pebble tec floor and walls. I reached out to a pool service company and inquired about their services and they want to do a hot start to remove the deposits. Is it safe to do a hot start for a...