Calcium Hardness Inceaser
Description & Specifications
Description & Specifications
- High pH levels can deplete your pool's available chlorine resulting in algae growth
- pH down is great for lowering pH levels to prevent the burning of swimmers eyes and nose and dry itchy scalp and skin
- Aid in preventing scaling, cloudy water and reduced chlorine effectiveness
- This product is also called Sodium Bisulfate
- Also commonly referred to as pH Minus or pH Decreaser
Pure Pool SuppliesTM pH Down helps lower pH levels and helps prevent cloudy water and scaling in pools. pH Down helps prevent itchy skin.

pH Level | Add per 10,000 Gallons |
pH from 7.2 to 7.6 | Ideal |
pH from 7.7 to 7.8 | Add 6 ounces |
pH from 7.9 to 8.0 | Add 12 ounces |
pH from 8.1 to 8.4 | Add 20 ounces |
pH above 8.4 | Add 24 ounces |
Directions
Directions
Directions: Always test the water prior to using this product. Pre-dissolve this product in a pail with water and slowly pour around the perimeter of your pool while circulation equipment is running and the pool is not in use. Wait at least two hours after the use of this product to enter the water.
Dosage: If the pH is above 7.6 add this product in accordance with the directions to bring the pH into an acceptable level, between 7.2 and 7.6 using the dosage chart.
Re-Entry: Test water and enter when the pH reaches ideal 7.2-7.6 range.

pH Level | Add per 10,000 Gallons |
pH from 7.2 to 7.6 | Ideal |
pH from 7.7 to 7.8 |
Add 6 ounces |
pH from 7.9 to 8.0 |
Add 12 ounces |
pH from 8.1 to 8.4 | Add 20 ounces |
pH above 8.4 | Add 24 ounces |
Storage & Disposal
Storage & Disposal
Storage And Disposal: Keep this product sealed in the original container in a cool, dry, well ventilated area. Do not store this product wet. Do not keep near open flames. Keep out of reach of children and pets. Do not re-use this container. After use, rinse container well with water and dispose of it with trash collection.

pH Level | Add per 10,000 Gallons |
pH from 7.2 to 7.6 | Ideal |
pH from 7.7 to 7.8 |
Add 6 ounces |
pH from 7.9 to 8.0 |
Add 12 ounces |
pH from 8.1 to 8.4 | Add 20 ounces |
pH above 8.4 | Add 24 ounces |