Hi. I wanted get some opinions. I just opened my pool. This was the pools first opening. When I test calcium, I get 560. When I take a water sample to the Anthony Sylvan store, they showed 330 this past Friday and 270 Saturday. My kit is a Taylor and I bought it last year. I keep it in indoors. Is the solution still good?? I need to make a decision on whether to drain water. Lastly, I also posted a few days ago of "crystal like stuff" being sucked up by my Polaris 360. It looks from the responses that this is calcium sulfate. Maybe this is why the readings are high?.....but baffled why the store is showing normal readings