Plaster chips?
New house. Gunite/plaster pool. Grew up maintaining vinyl liner pool.
Are these plaster chips? (Photo in comments) Hardness levels seem fine so I don’t believe it’s scale. Previous owners had a pool guy come once a week but 95% sure he just kept chemicals in check, no cleaning. Not sure how they kept on top of cleaning but looked good when I moved in.
I believe they got this resurfaced about 2-3 years ago. Bad sign or typical if they didn’t keep it squeaky clean? Kept picking it up after 4-5 runs of the pentair prowler.