SPAGUARD CALCIUM HARDNESS INCREASER raises calcium hardness in spa and hot tub water. The desired calcium hardness level in spa water should be 100 to 200 ppm. Low calcium hardness, below 100 ppm could cause spa water to be corrosive which may damage spa surfaces and/or equipment.

Measurement and dosing: 

Use all level measurements. 3 teaspoons= 1 tablespoon; 2 capfuls= 1 tablespoon; 1/4 cup= 4 tablespoons.

Directions for use:

1. Use an accurate test method to determine calcium hardness of water.
2. Using the total hardness test results determine the required amount of SpaGuard Calcium Hardness Increaser needed to adjust the calcium to maintain a reading of 100 to 200 ppm. For spas on the BioGuard SoftSoak program, adjust the calcium hardness level to maintain a 200-300 ppm reading.
3. With pump running at high speed, scatter the required amount of product over the spa water and continue running pump for 30 minutes.
4. Do not predissolve this treatment as heat is generated when it contacts water.
5. When using SpaGuard Calcium Hardness Increaser, measure carefully.
6. Inaccurate measuring could result in a calcium hardness level other than desired.