SpaGuard Calcium Increaser (12 oz)

Calcium Hardness Increaser

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- For raising Calcium levels
- Protects spa equipment from corrosion 

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. 

Product Dosage

- Use all level measurements 1 capful = 2 teaspoons; 3 teaspoons = 1 tablespoon

 Spa Capacity(gallons) 25 ppm 50 ppm 60 ppm 100 ppm
100 2 Tbsp
2 Tbsp
2 Tbsp+1 tsp
4 Tbsp
1 1/2 Tbsp
3 Tbsp
3 Tbsp+1 tsp
6 Tbsp
2 1/2 Tbsp
5 Tbsp
6 Tbsp
10 Tbsp
4 Tbsp
8 Tbsp
9 Tbsp+tsp
16 Tbsp
500 5 Tbsp 10 Tbsp 12 Tbsp 20 Tbsp


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