SpaPure pH Down | Spa pH Decreaser

• 1 x SpaPure pH Down (1.5 lb resealable container, granular)

• Lowers high pH — brings alkaline water back into the safe 7.2–7.6 range
• Prevents scale and cloudy water — stops the buildup and haze that high pH causes
• Protects equipment — guards your heater, plumbing, and surfaces from scale and corrosion
• Boosts sanitizer efficiency — chlorine and bromine work far better at proper pH
• Also lowers total alkalinity — sodium bisulfate adjusts both, ideal when both run high
• No wait to soak — granular formula works immediately, with no foam or residue

The active ingredient, sodium bisulfate, is a dry acid. When it dissolves it releases hydrogen ions that neutralize the excess alkalinity driving pH up — lowering both the pH and the total alkalinity of the water. Aim for a pH of 7.2–7.6, the range where water is clear, non-scaling, and comfortable, and where your sanitizer performs at its best.

It's the mirror image of pH Up: where pH Up (soda ash) raises pH, pH Down (sodium bisulfate) lowers it. Because pH naturally creeps upward in a working spa, pH Down is the one you'll typically reach for more often.

Pro Tip: Broadcast it with the pump running and never add it to a spa with the circulation off. Sodium bisulfate is a concentrated dry acid, and a pile of it sitting on the acrylic shell can etch or bleach a spot. Spreading it across moving water lets it dissolve and disperse instantly, protecting the surface.

Never mix different products together in the same bottle or pail. Add this product directly to the water. Test spa water frequently and make adjustments as needed, aiming for a pH of 7.2–7.6.

1. Turn on the circulation system.
2. If pH is between 7.2 and 8.0, add 1/4 ounce (2 teaspoons) per 500 gallons directly to the spa.
3. If pH is greater than 8.0, add 1/2 ounce (4 teaspoons) per 500 gallons.
4. Circulate for 15 to 30 minutes and retest pH. If pH is still above 7.6, repeat until it sits between 7.2 and 7.6.

Pro Tip: Make pH adjustments before you shock, not after. Your sanitizer and shock work best in the 7.2–7.6 window, so getting pH right first means the chlorine or bromine you add next is far more effective — and you avoid wasting product fighting out-of-range water.

• Brand: SpaPure
• Manufacturer: Haviland Consumer Products
• Part Number: [PASTE PART NUMBER]
• Product Type: pH decreaser (balancer)
• Form: Granular
• Net Weight: 1.5 lb
• Active Ingredient: Sodium bisulfate
• Function: Lowers pH and total alkalinity
• Dosage (pH 7.2–8.0): 1/4 oz (2 tsp) per 500 gallons
• Dosage (pH above 8.0): 1/2 oz (4 tsp) per 500 gallons
• Target Level: pH 7.2–7.6
• Retest: Circulate 15–30 minutes, then retest and repeat if needed
• Ready to Use: No waiting time to soak; no foam or residue
• Compatible Sanitizers: Chlorine, bromine, biguanide, silver/mineral, and ozone systems
• Application Note: Never mix with other products in the same container; add directly to spa water with the pump running
• Shipping: Standard ground; not classified as a hazardous material (eligible for mail return under standard policy)

SpaPure pH Down is compatible with chlorine, bromine, biguanide, silver/mineral, and ozone systems, so it works in virtually any spa. As a balancer, it's part of the foundation you maintain alongside your sanitizer.

It's the counterpart to pH Up (which raises pH when it drops too low) and works alongside an alkalinity increaser and SpaPure test strips. Balance pH and total alkalinity before adding sanitizing and shock products. Never mix pH Down with other chemicals in the same bottle or pail — always add it directly to the spa water.