My in-laws just bought a house here in Houston with a pool. I have a SWG pool myself, but don't have much experience with traditional pools.
The pool definitely looks like it has some black algae, black clumps with crusty cover, turns green if scraped. They also have a yellow tint on the floor and walls. The yellow is not a build up or clump, but just a tint. I can rub it off the wall with my finger. Is this just pollen, even on the walls? Or is this a type of algae?
Given the cya level 100, should I recommend a partial drain? Is 50-60 a good target for CYA for traditional pool? I know it will be easier to shock the pool if I lower the CYA.
If people only use tablets, do they always have to periodically drain water to reduce the CYA? Or, does backflushing typically waste enough water to keep CYA in check?