Total dissolved solids (TDS) comprise inorganic salts (principally calcium, magnesium, potassium, sodium, bicarbonates, chlorides, and sulfates) and some small amounts of organic matter that are dissolved in water.The higher the TDS levels in the water, the greater the probability of harmful contaminants in the water. Normally, the TDS value of purified water is 1. TDS is only one of measures on water quality.
