Hardness, or TH, gives the total concentration of calcium and magnesium salts on: 1°fH / 0.562°dH hardness corresponds to 10 mg/L (ppm) calcium carbonate.
The harder the water, the bigger the risk of calcium and magnesium salt deposits on the walls of pools and spas. On the other hand, water that is too soft can be corrosive.
Hanna Instruments Quick Hardness Chemical Test Kit
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