- Sku: LEIS CALCIUM 1
- Vendor: Leisure Time
Leisure Time Calcium Booster
Leisure Time Calcium Booster for Hot Tubs & Spas
Leisure Time® Calcium Booster helps maintain proper calcium hardness levels in hot tubs and spas. Balanced calcium levels are essential for preventing foaming, protecting spa equipment from corrosion, and maintaining clear, comfortable water.
Regular use helps extend the life of your spa’s heater, plumbing, and components while improving overall water balance for a better soaking experience.
Key Benefits
- Raises calcium hardness in spa and hot tub water
- Helps prevent foaming and equipment corrosion
- Supports balanced water chemistry
- Helps extend the life of spa equipment
- Compatible with chlorine, bromine, ozone, and biguanide sanitizers
Dosage Guide
| Raise CH (ppm) | 150 gal | 200 gal | 300 gal | 400 gal | 500 gal |
|---|---|---|---|---|---|
| 20 ppm | 0.5 oz | 0.5 oz | 1 oz | 1.5 oz | 1.5 oz |
| 40 ppm | 1 oz | 1.5 oz | 2 oz | 2.5 oz | 3 oz |
| 80 ppm | 2 oz | 2.5 oz | 4 oz | 5 oz | 6.5 oz |
All values shown in dry ounces.
Directions for Use
- Test calcium hardness weekly using Leisure Time test strips.
- Add the appropriate amount of Calcium Booster according to the dosage table.
- Maintain calcium hardness levels between 200–400 ppm.
- Run spa jets or circulation pump on high speed for at least 15 minutes to distribute.
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Leisure Time Calcium Booster

