Sirona® Spa Down
Product Overview
Pool and hot tub technicians reach for Sirona Spa Down to rapidly bring high pH and total alkalinity back into balance without clouding the water.
Formulated with 95% Sodium Bisulfate, Sirona Spa Down delivers fast, granular pH and alkalinity reduction in a convenient 2.5 lbs. container. This dry acid dissolves quickly when broadcast across the water surface with jets running, preventing scale buildup and protecting heater elements. It reliably brings elevated water parameters down to the target pH range of 7.2–7.6 and total alkalinity of 80–120 ppm across chlorine, ozone, and bromine sanitizing systems.
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Benefits & What Makes It Different
95% Sodium Bisulfate Formulation
Delivers fast-dissolving dry acid power to lower high pH and total alkalinity without leaving stubborn residue.
Broad Sanitizer Compatibility
Fully compatible with chlorine, biguanide, and bromine setups to maintain stable sanitizer efficiency.
Compact 2.5 lbs. Size
Conveniently packaged 2.5 lbs. canister allows precise granular dosing for hot tubs and portable spas.
Product Details
Sodium Bisulfate 95%
Add approximately 1 to 2 tablespoons per 500 gallons with jets running to lower pH into the 7.2–7.6 range; retest after 30 minutes.
Compatibility
- Compatible with chlorine, bromine, ozone, and mineral sanitizers
- Do not pre-dissolve or mix directly with other pool or spa chemicals
When To Use This
Pro Tip
In regions with naturally hard tap water or high fill-water alkalinity, test total alkalinity before pH; bringing alkalinity down into the 80–120 ppm target range stabilizes your pH and prevents rapid rebound.
Common Questions & Instructions
How does Sirona Spa Down adjust hot tub pH and total alkalinity?
Sirona Spa Down uses 95% Sodium Bisulfate to safely lower elevated water parameters into the ideal pH range of 7.2–7.6 and total alkalinity range of 80–120 ppm, helping prevent mineral scaling.
Can I use Sirona Spa Down in a spa that uses bromine sanitizer?
Yes, this formula is fully compatible with bromine, chlorine, mineral, and ozone systems. It optimizes sanitizer efficiency by keeping pH within the standard 7.2–7.6 window.
How should I add this 2.5 lbs. container of Spa Down to my hot tub?
Turn on the jets or air blower and broadcast the measured granular dose evenly across the surface. Allow water to circulate for 15 to 30 minutes before retesting levels.
