De, Alage or Calcium buildup?

reap32

New member
Jul 7, 2024
1
10307
Hello. At the end of last season I started to see deposits on the pool floor every day. I ended up closing the pool unresolved. I opened the pool last week with a ripped cover and a green pool. I started the slam process and my pool went from green to turquoise to clear. Except for the same problem as last year. I ordered more solutions for my Taylor test kit and they are coming tomorrow. Can someone tell me what this looks like in the mean time? I plan to take apart everything this weekend to see what’s going on. It’s a fiberglass pool. Thank you.
 

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Welcome to TFP.

Put a few drops of muriatic acid on the stuff, and if it bubbles, it is calcium.

If your pool passes a Overnight Chlorine Loss Test, it is not algae.

Looks like DE. What model filter do you have?

Have you checked your DE filter grids carefully for tears?