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Overnight, in a covered pool with 90 degree water, how much FC loss should one experience? Assume the pool is "clean" (no algae, etc) and chemistry is otherwise ideal?

I have a 14k gallon inground, covered pool. The water is crystal clear, and there is no visible algae. However, the pool will not hold chlorine, and I am losing CYA over time (without water changes). Based on this article (poolsolutions.com...), I have been under the belief that some kind...