When you cover a pool, CC's and CC precursors -- pool goo -- can't escape. Pool goo (it's a technical term here) consists of bad pool chemicals, sweat, pee, suntan lotion PLUS whatever else gets in the pool and reacts with chlorine. Sunlight, chlorine, and aeration get rid of pool goo. Lose the sunlight, and cover the pool with a vapor-tight cover, and Voila', you have an indoor-chemistry pool. Indoor-chemistry pools have problems with goo.
So, while I don't know exactly where YOUR particular CC's are coming from, they aren't unexpected.
Does that help?
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