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Just downloaded the app. My pool is pebble tec. Is that considered Vinyl, plaster or fiberglass? I'm including a photo if that helps. Thanks in advance

Hello all, this is my first post here. I've been reading a lot, but still a little vague on a lot of the chemistry. I bought my house a little over two years ago and it already had a pool. I just drained it this past winter, because the CYA levels were probably in the 200+ range. I learned...