Spa Choice® Increase Calcium

Increases Calcium Hardness & Prevents Corrosion

Spa Choice Increase Calcium is used to increase calcium hardness in spas and hot tubs in areas with low levels of hardness.  Low hardness will etch plaster and corrode spa equipment.  Before adding Increase Calcium to your spa, test the water with a calcium hardness test kit.  The ideal hardness level is 200-400 ppm (parts per million). 

Spa Choice Increase Calcium Directions for Use

One ounce of Increase Calcium per 500 gallons of spa water increases calcium hardness by seven ppm.

1. Determine the amount of product to be added using a calcium hardness test kit. 

2. Pour the proper amount of Spa Choice Increase Calcium into your spa or hot tub with the equipment turned on. 

3. Run spa filter for 1-2 hours.

4. Water may be retested 20 minutes later.