I have the same issue. I cleaned it out and it’s back…it’s hard but turns to a paste in fingers when squished..like wet chalk almost. What is going on? I kept finding blue stuff in the bottom of the pool and realize my chlorine generator wasn’t working after levels kept going out. I stripped the chlorine generator down and found this blue gunk build up pressure washed it out put it back together 24 hours later it’s building back up.
Moved from here.
Moved from here.
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