What is the suitable hardness of drinking water ?

the suitable total ppm of drinking water

Total dissolved solids (TDS) by summation
Suitable -1500 milligrams/Liter or less- the EPA has recommended that domestic public water supplies should not contain more than 500 milligrams/Liter. Refer to the section on tolerances.
Unsuitable- greater than 1500 milligrams/Liter

Suitable - 750 milligrams/Liter or less- The EPA recommends 250 milligrams/Liter or less for public water supplies. Refer to the section on tolerances.
Unsuitable - over 750 milligrams/Liter - It should be noted that high levels of sulfate appear to have no physiological action other than a laxative effect towards new users. Much of the ground water in Wyoming is high in sulfates and has been used for years with no adverse effects.

Nitrates + Nitrites as N
Suitable - 10 milligrams/Liter or less - The maximum level allowed in public water supplies by the EPA is 10 milligrams/Liter. This stan-dard is based on the effects of nitrate on infants whose formula is made from the water. Adults can generally tolerate much higher levels. Refer to the section on tolerances.
Unsuitable - Over 10 milligrams/Liter

Hardness - Calcium and Magnesium expressed as Calcium Carbonate

These analytes do not usually effect the quality of drinking water adversely; however, high levels of hardness may have detrimental effects on plumbing materials, fixtures and appliances such as hot water tanks.
Hardness normally means the amount of salt in water. I think about 1 cup of ocean water to 4 coups of fresh water. A technique to stretch drinking water.
500ppm is the max limit for suitible drinking water. generally drinking water is about 10-20ppm
Well hardness is the presence of minerals in drinking water. These minerals are normally calcium and magnesium. These minerals are already present in your body so it would really not be a hazard. It would only add to your mineral consumption. The only annoyance of hard water is when washing clothes.

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