Maintain perfectly balanced pool water with Lawrasons pH Minus 20kg (Product Code 27082P85) — a professional-grade granular pH decreaser formulated with sodium bisulfate. This powerful dry acid safely lowers high pH levels and helps reduce total alkalinity in both above ground and inground swimming pools.
For saltwater pools, the 20kg size is the ideal seasonal supply. Salt chlorine generators naturally cause pH to rise over time due to aeration and chlorine production, making regular pH adjustment essential. This bulk size provides consistent, reliable control throughout the entire swimming season.
Key Features & Benefits
Active Ingredient: Sodium Bisulfate
A dependable dry acid formula that lowers pH and total alkalinity.
Perfect for Salt Pools
Salt systems frequently require pH adjustment — 20kg is typically the right amount for a full residential season.
Prevents Scale & Cloudy Water
Reduces calcium buildup on liners, pool walls, salt cells, plumbing, and heat exchangers.
Improves Chlorine Efficiency
Balanced pH ensures chlorine sanitizes effectively.
Enhances Swimmer Comfort
Reduces irritation to skin, eyes, nose, and throat.
Safer Alternative to Liquid Muriatic Acid
Granular dry acid is easier to store, handle, and measure with no harsh fumes.
Compatible with All Pool Types
Safe for vinyl liner, fiberglass, and concrete pools.
Why Proper pH Matters
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High pH (above 7.8): Scaling, cloudy water, reduced chlorine effectiveness.
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Low pH (below 7.2): Corrosion, heater damage, liner wrinkling, and irritation.
Maintaining pH between 7.2 – 7.8 protects equipment, especially heaters and salt cells, and keeps water clear and comfortable.
Pro Tip: Unbalanced pH can cause vinyl liners to wrinkle.
Directions for Use
Dosage:
Add 100g per 10,000 litres (approx. 2,200 gallons) when pH rises above 7.8.
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With pump running, sprinkle evenly over the water surface.
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Test pH every 2 hours.
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Repeat until pH returns to 7.2 – 7.8.
After superchlorination, dissolve in a bucket of water before adding. Always adjust pH before adding chlorine for best results.
Average Seasonal pH Down Usage Guide
(Estimates vary depending on weather, rainfall, and salt system use.)
| Pool Type | Pool Size | Approx. Volume | Avg. Seasonal pH Minus Needed |
|---|---|---|---|
| Hot Tub / Spa | 1,000–2,000 L | Small | 1–2 kg |
| 10–12 ft Above Ground | 5,000–12,000 L | Small | 5–8 kg |
| 15–18 ft Above Ground | 15,000–25,000 L | Medium | 8–15 kg |
| 21–24 ft Above Ground | 30,000–50,000 L | Large | 15–20 kg |
| Small Inground Pool | 50,000–70,000 L | Residential | 18–25 kg |
| Large Inground Pool | 75,000–100,000+ L | Residential/Commercial | 25kg+ |
For most saltwater above ground and inground pools, one 20kg pail typically covers a full season of adjustments.
Professional Pool Maintenance Made Easy
The 20kg (approx. 44 lb) container offers long-lasting value for residential and commercial pool owners. Whether correcting high pH after heavy rainfall, increased swimmer load, or routine salt system adjustments, Lawrasons pH Minus 27082P85 delivers dependable, easy-to-handle water balance control.
Keep your pool water clear, comfortable, and equipment-protected all season long with Lawrasons pH Minus — the trusted dry acid solution for precision pH management.
