SpaGuard pH Decreaser | Lowers Spa pH & Alkalinity

• 1 x SpaGuard pH Decreaser — 22 oz. (resealable bottle, granular)

Note: pH Decreaser lowers pH and total alkalinity. If you need to raise pH instead, that's the companion product, SpaGuard pH Increaser. Keep the bottle tightly sealed and store it in a cool, dry place away from other chemicals — never mix it with other chemicals in concentrated form.

• Lowers pH and total alkalinity — corrects basic, high-pH water and brings both numbers back into range.
• Protects spa and equipment — prevents the scale buildup on surfaces, heaters, and fittings that high pH causes.
• Prevents cloudy water — clears the cloudiness that develops when pH runs high.
• Restores sanitizer effectiveness — chlorine and bromine work far better with pH in the correct range.
• Improves bather comfort — balanced water is gentle on eyes and skin.
• Works with every common sanitizing system — chlorine, bromine, ozone, and biguanide.

pH measures how acidic or basic your water is, with the spa target sitting right around 7.4–7.6. When pH rises above that range, the water becomes basic — minerals fall out of solution and form scale, the water clouds, and a growing share of your chlorine converts to a form that can't sanitize effectively. Total alkalinity, the buffer underneath pH, often rises along with it and needs to come down too.

SpaGuard pH Decreaser is sodium bisulfate, a dry acid. Broadcast into circulating water, it dissolves and releases acidity that neutralizes the excess, lowering both pH and total alkalinity back toward target. Because it's added gradually and retested, you can dial the water in precisely rather than overshooting into low, corrosive pH — keeping the correction controlled and your water balanced.

Pro Tip: Add pH Decreaser in stages, circulating and retesting between doses. Overshooting into low pH means the water turns acidic and corrosive — which then needs pH Increaser to fix, leaving you chasing your numbers in both directions. Sneaking up on the target is faster in the long run.

1. If pH rises above 7.6, apply the product per ALEX Pro recommendations (or your water-test guidance) for the correct dose.
2. Apply by broadcasting the product evenly across the spa with the pump running.
3. Circulate for 30 minutes and retest pH. Repeat as needed to reach the target range.

Pro Tip: Aim for a pH of 7.4–7.6 and total alkalinity of 80–120 ppm. A SpaGuard dealer water test (using ALEX) takes the guesswork out of exactly how much to add for your spa's volume and current readings.

• Product: SpaGuard pH Decreaser — Spa Water Balancer
• Brand: SpaGuard (BioGuard family)
• SKU: 42634BIO
• Size: 22 oz.
• Form: Granular — dry acid
• Function: Lowers pH and total alkalinity
• Active Ingredient: Sodium Bisulfate 93.2%
• Other Ingredients: 6.8%
• Application: As needed when pH rises above 7.6
• Method: Broadcast across the water with the pump running; circulate 30 minutes and retest
• Target pH: 7.4–7.6
• Target Total Alkalinity: 80–120 ppm
• Sanitizer Compatibility: Chlorine, bromine, ozone, and biguanide
• Surface Compatibility: Safe for all common spa surfaces
• Country of Origin: Made in USA
• Shipping: Ships UPS Ground only
• Hazmat Classification: Regulated acid (sodium bisulfate) — classified as a hazardous material; ships ground only

pH Decreaser is a water balancer that works with whatever sanitizing system you use:

• Chlorine spas — fully compatible.
• Bromine spas — fully compatible.
• Ozone systems — compatible as part of a balanced-water routine.
• Biguanide systems — compatible.
• All spa surfaces — safe for use with all common spa surfaces.

Important: pH Decreaser is a balancer, not a sanitizer. It corrects water chemistry but doesn't sanitize — use it alongside your regular sanitizer and shock.