Sirona Spa Down is a fast-dissolving pH and alkalinity decreaser that brings high, alkaline spa water back into balance. This granular sodium bisulfate formula lowers both pH and total alkalinity at once — the go-to correction when your water has drifted high.
High pH quietly undermines everything you want from your spa. When pH climbs above 7.8, the water turns cloudy, scale begins forming on surfaces and inside your heater and plumbing, water can take on a dull or discolored look, and your sanitizer loses efficiency — chlorine and bromine work far harder in alkaline water. Because a working spa’s pH naturally tends to drift upward over time, a decreaser is an essential on-the-shelf staple.
Spa Down reverses that drift quickly. Bring pH back into the 7.2–7.8 range and the water clears, scale stops forming, your sanitizer returns to full strength, and every soak feels clean, comfortable, and inviting again.
Pro Tip: Spa Down lowers total alkalinity along with pH. That’s ideal when both have drifted 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 pull alkalinity below range chasing pH. When both are too high, this is the efficient one-product fix for the pair.
Brand
Sirona®
