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Caldera Spa Replacement Cover Buying Guide: Fit, Foam, and Materials That Matter A worn or waterlogged spa cover is one of the most common, and most overlooked, reasons a well-maintained Caldera spa suddenly starts costing more to run. The heater has to fight harder to hold temperature, evaporation increases, and the whole system works overtime to compensate for a cover that no longer seals properly. Buying the right replacement does not need to be complicated once you understand what actually a … read more