Special filtering equipment is used to remove sediment in a measured amount of water. The filtered water is then evaporated in a pre-weighed container. After the water has completely evaporated, the container is reweighed to determine the amount of dissolved material remaining. A conductivity meter can also be used to estimate total dissolved solids. The conductivity meter reading is multiplied by 0.6 to estimate the amount of total dissolved solids in parts per million.

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