Is there a way to confirm this? Do I contact my pool builder or manufacturer? I just read an article that has me terrified the white substance is actually something called "fiberglass chalking".No. Modern fiberglass did away with the concerns. IMO the old recommendation should stay listed in case anyone has an older fiberglass pool.
Low calcium hardness virtually guarantees aggressive water for most of the year; water that will degrade the gel coat of the pool and lead to problems like chalking.
Fiberglass chalking
The main concern is aggressive (low-LSI) water, which attacks and weakens the gel coat. Once the gel coat is compromised, chlorinated water can oxidize the material from within, which turns the surface a hazy white color. We call this fiberglass chalking. It's the byproduct of degradation and oxidation, and the damage is permanent.What is fiberglass "chalking", and what causes it?
Fiberglass pools often turn white, with what looks like chalk or calcium scale. Chalking is actually degradation and oxidation of the fiberglass gel coat.
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