White clumps in pump basket

BTK2

Member
Jul 3, 2024
18
Atascadero, CA
Pool Size
24000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Poured Muriatic acid on these and got fizzing. Is this scale or calcium. I recently added CYA on 07/01/24. Does CYA fiz?
Twice now it has been in the basket. Dark spots are from the dirt when I dropped it. It has uniform white color and very soft and chalky when broken up, easy to crush into powder.
 

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