St. Cyr Spa Ph/Alkalinity Down 3lb. (No Returns on Chemicals) St. Cyr Spa pH/Alkalinity Down is a granular acid product containing sodium bisulfate, commonly used to lower both pH and alkalinity levels in hot tub water when they are too high. Maintaining proper pH (7.2–7.8) and alkalinity (80–150 ppm) is crucial to prevent issues like cloudy water, scale buildup, and reduced sanitizer effectiveness. Key Features and Benefits Contains sodium bisulfate (dry acid) to safely reduce pH and alkalinity Prevents cloudy water and scale caused by high pH or alkalinity levels Helps chlorine and other sanitizers work more effectively Granular form allows controlled dosing for precise water balance Suitable for weekly adjustments or as needed based on water testing Usage and Directions Test spa water pH and alkalinity before application When pH exceeds 7.8 or alkalinity rises above 150 ppm, add St. Cyr pH/Alkalinity Down as directed on the product label Dissolve the recommended amount of granular acid in a bucket of water before adding slowly to spa water with jets running Circulate water for at least 1–2 hours and retest before adjusting further Handle with care; use gloves and avoid direct contact due to acidic nature Important Notes Lower alkalinity first if both pH and alkalinity are high, as this stabilizes water balance more effectively Avoid overdosing; add small amounts gradually while monitoring water parameters Store in a dry, cool place away from incompatible chemicals and moisture Using St. Cyr Spa pH/Alkalinity Down 3lb helps maintain clean, clear, and balanced spa water, protecting your hot tub and ensuring a better soaking experience.
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