- Hardness increaser, 16 oz. liquid - calcium chloride additive.
- Apply at 1/2 oz. per 250 gals and re-test in 30 minutes
- Ideal hardness for mineral systems is 150-400 ppm.
Discount Spa Parts & Accessories since 1997
Free Shipping on orders over $75
We are THE source for your DIY spa repairs and upgrades!