BioGuard Smart Shield 1 Qt. | Liquid Pool Cover

BioGuard Smart Shield is a liquid pool cover. It forms an invisible barrier on the water surface that reduces evaporation — conserving water and preserving heat — and a single application lasts up to 30 days. Evaporation is a bigger drain than most pool owners realize, and it costs money two ways at once. The obvious one is water: an uncovered pool can lose a substantial volume over a hot, dry month, and every gallon you replace also dilutes your chemistry and has to be rebalanced. The less obvious one is heat. Evaporation is the single largest route by which a pool loses warmth — far more than conduction through the walls or radiation to the night sky. Every gallon that evaporates carries a large amount of energy out of the pool with it. That's why a heated pool without a cover is expensive to run. The heater spends much of its output replacing warmth that's leaving through the surface, all night, every night. A solid or solar cover solves this well — and nobody uses one consistently, because hauling a cover on and off a pool is genuinely inconvenient. Smart Shield does a meaningful share of the same job with no cover to handle at all. You pour it in once a month and it works continuously, including overnight when heat loss is highest and nobody's around to put a cover on. It's invisible in the water, doesn't interfere with swimming, and needs no equipment. Dosing is simple at 8 fl oz per 15,000 gallons monthly, and a single quart covers four months on a 15,000-gallon pool. Pro Tip: This product earns its keep fastest on a heated pool in a dry climate. Evaporation is the dominant heat-loss mechanism in any pool, and it accelerates sharply when the air is dry, the wind is up, and nights are cool — conditions that describe most of the Intermountain West through the entire swim season. If you heat your pool, the gas or electricity you're spending overnight is largely replacing warmth that left through the surface, and a liquid cover addresses that every night without anyone having to remember anything. On an unheated pool the water savings still matter, but the payback is slower. Brand BioGuard®