SpaGuard® pH Decreaser Granular Spa pH Reducer, 22 oz 42634BIO
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Key Features & Benefits
Lowers High pH
Brings spa water back to the 7.2–7.6 label range
Dry Granular Acid
Engineered for seamless compatibility with original mounting points for secure placement.Label: safer and easier to use than liquid acids
Built-In Measure
1 level capful = 2 tsp = 0.5 oz
Label Dosage Chart
200 gal: 0.5–1.5 tsp depending on current pH
Genuine SpaGuard®
SpaGuard® part number 42634BIO
30-Minute Circulation
Sprinkle with the pump on, circulate 30 minutes, retest
Product Overview
SpaGuard® pH Decreaser lowers the pH of water in spas and hot tubs. The label calls for pH to be kept at 7.2 to 7.6, as measured by an accurate test method. High pH can cause cloudy water and scale and makes sanitizers less effective. It is a dry granular acid (sodium bisulfate) that the label describes as safer and easier to use than liquid acids, in a 22 oz bottle.
Test pH, and make sure total alkalinity reads at least 125 ppm before adding this product. Then use the label chart: in a 200-gallon spa, 0.5 tsp lowers a 7.6–7.8 reading, 0.75 tsp a 7.8–8.0 reading and 1.5 tsp an 8.0–8.4 reading; a 1,000-gallon spa takes 2, 4 and 7.5 tsp. One level capful equals 2 teaspoons (0.5 oz), so the cap works as a measure. With the pump operating and the spa unoccupied, sprinkle it into the water and let the pump circulate for 30 minutes. In spas with an aerator, turn the aerator off before adding it. Retest and adjust as needed.
Do not add it near metal fittings, do not let pH drop below 7.2, and brush away any undissolved product so it does not sit on the spa surface. The label carries the DANGER signal word: causes severe burns. Avoid contact with eyes, skin and clothing, wear goggles or safety glasses and rubber gloves, avoid breathing the dust, and never mix it with other chemicals. Keep it dry in the original tightly sealed container in a cool, dry, well-ventilated area. It is a water balancer and does not sanitize the spa.
Frequently Asked Questions
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It lowers the pH of spa and hot tub water. The label calls for pH to be kept at 7.2 to 7.6.
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Use the label chart. In a 200-gallon spa: 0.5 tsp at pH 7.6–7.8, 0.75 tsp at 7.8–8.0, 1.5 tsp at 8.0–8.4. A 1,000-gallon spa takes 2, 4 and 7.5 tsp.
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Use level measurements. One level capful equals 2 teaspoons, or 0.5 oz, so the cap works as a measure.
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Yes. The label says total alkalinity should read at least 125 ppm before you add pH Decreaser.
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With the pump operating and the spa unoccupied, sprinkle it into the water and circulate 30 minutes. Turn any aerator off first. Then retest.
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Do not add it near metal fittings, and do not let undissolved product sit on the spa surface. Break up lumps by brushing.
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Do not let pH drop below 7.2. Add in small steps and retest.
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Sodium bisulfate, a dry granular acid.
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DANGER: causes severe burns. Avoid contact with eyes, skin and clothing, wear goggles or safety glasses and rubber gloves, and avoid breathing dust.
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No. It is a water balancer. Keep using your normal sanitizer.
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