- The ideal hardness level is 200-400 ppm
- 1 ounce of product per 500 gallons increases hardness by about 10 ppm
- This product is used to increase the calcium hardness in spas and hot tubs
- The ideal hardness level is 200-400 ppm
- 1 ounce of product per 500 gallons increases hardness by about 10 ppm
- This product is used to increase the calcium hardness in spas and hot tubs
