BioGuard Polysheen Blue | Pool Water Clarifier

BioGuard Polysheen Blue is a highly concentrated polymer clarifier that clears cloudy water by making invisible particles visible to your filter. At 1 fl oz per 5,000 gallons, it's one of the most economical products in the BioGuard line — a single quart treats 160,000 gallons. The problem it solves is one almost every pool owner runs into. The water tests perfectly — chlorine in range, pH balanced, alkalinity fine — and it still looks dull, hazy, or slightly milky. Nothing on the test kit explains it, and adding more sanitizer doesn't help. The cause is particles too small for your filter to capture. Dust, pollen, dead algae, fine dirt, and the residue of body oils and lotions can all sit in the water at sizes measured in fractions of a micron, small enough to pass straight through a sand bed or cartridge and recirculate indefinitely. Individually they're invisible. Collectively they scatter light, and that scattering is what you're seeing as cloudiness. Polysheen Blue's polymers bind those particles into larger clumps that the filter can actually trap. You aren't dissolving the haze — you're gathering it up so the equipment you already own can remove it. That's why the directions call for running the pump for at least 8 hours afterward: the product does the gathering, and the filter does the removing. It works with every sanitizer type and every filter type, requires no diluting, and does not affect pH, so clearing your water doesn't set off a rebalancing cycle. It's recommended for weekly use as a maintenance product, not just as a rescue — a pool that gets a weekly ounce rarely gets cloudy in the first place. Pro Tip: Clean or backwash your filter before you add this, not after. Polysheen Blue works by loading your filter with material it couldn't previously catch, so a filter that's already dirty has nowhere to put it. Starting with clean media is the single biggest factor in whether the treatment works in one application or three. Then watch your pressure gauge over the next day or two — a rise of 8 to 10 psi above your clean baseline means the filter is full of what it just removed and needs cleaning again. That pressure rise isn't a problem; it's proof the product did its job. Brand BioGuard®