I would avoid liquid solar cover. Putting unknown stuff in the pool water will produce unknown results - ususally un-good, probably very un-good. A dark color liner will do alot more for capturing the sun's heat that falls on your pool - with no mystery goop. The biggest advantage of haing a solar cover (think thermal blanket) is keeping the heat in overnight - especially when it's cool and breezy.
Someone on this forum (I can't find it now) solved the solar blanket storage issue by cutting the round solar blanket into quarters and rolling each onto a length of capped pipe.
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