The total salt content of recycled water is not much different from that of fresh water. Typically, it is slightly higher than for fresh water.
Recycled water is created by extensively treating wastewater effluent to remove chemical and biological contaminants. Though purified to a high degree, the recycled water often contains a small amount of salt picked up by the water during its previous cycle of use. That's why, for recycled water, the total dissolved solids (TDS) content typically exceeds that of the original source water by a small amount. The increase in concentration usually is in the range 140 to 400 mg/L.
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