The TDS is a measure of the total concentration of inorganic matter dissolved in the water. It is also referred to as salinity and commonly involves calcium, magnesium and sodium in the bicarbonate, chloride or sulfate form, with traces of iron, manganese and other substances. If TDS concentrations are high, further tests need to be conducted to determine specific contaminants. The acceptable range in pH for groundwater is from 6.5 to 8.5. In addition, pH can have an effect on certain water treatments.
Hard water can cause problems because of accumulation of scale in the water delivery system.
However, hardness of water is not a problem for pig health and performance. Iron . . Iron Iron can promote growth of certain bacteria and result in precipitation of iron compounds. Although there is no health risk, iron concentrations of 2 to 3 ppm can block water flow from water nipples. At a concentration of 5 ppm or greater, oxytetracycline added to the water can be inactivated.