Sounds like you have a pretty good understanding of things. It is hard to get every fine floating particle out of the water. I am not familiar with the filtration system on these Intex pools. Maybe someone who is more familiar can offer an opinion. The skimmer socks, (or old nylon stocking) can help catch some of the finer stuff. As far as the cya level, it is pretty much a matter of opinion about doing a partial drain to lower your cya level or just living with it at 75. I like mine around 40, but if you maintain adequate chlorine levels, you can live with it at 75. Some people (like Janet - aylad) deliberately run higher cya levels. She lives in Louisiana and also has the hot sun. For her pool, having the higher cya makes it easier to keep chlorine in her pool.
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