SpaPure pH Down is a pH decreaser that brings high, alkaline spa water back into the safe range. This granular sodium bisulfate formula lowers pH quickly and works the moment it hits the water — no waiting before you soak. High pH causes a cascade of problems that are easy to miss until they add up. When pH climbs above 7.6, the water turns cloudy, scale starts forming on surfaces and inside your heater and plumbing, and your sanitizer loses efficiency — chlorine and bromine simply work much harder at high pH. Left unchecked, you get dull water, scale buildup, shorter filter runs, and skin and eye irritation. Since a spa's pH tends to drift upward over time, a pH decreaser is a must-have on the shelf. pH Down reverses that drift. Bring pH back into the 7.2–7.6 range and the water clears, scale stops forming, and your sanitizer gets back to full strength. Pro Tip: pH Down lowers total alkalinity along with pH. That's useful when both are high, but if your pH is high while alkalinity is already in range, add it in small amounts and retest — you don't want to drop alkalinity out of range chasing pH. When both are too high, pH Down is the efficient one-product fix for the pair. Brand SpaPure®
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