What is Softened Water?
Softened water is water that has a low calcium and magnesium content. Water hardness usually means less than 100 ppm or 6 grains, also water that has gone through a Water Softener. Pools and spas should never be filled with soft water from a softener.
Water with less than 100 ppm of hardness should be increased to a minimum of 150 to 200 ppm using calcium chloride