The palatability of water with a total dissolved solids (TDS) level of less than about
600 mg/l is generally considered to be good; drinking-water becomes signifi cantly and
increasingly unpalatable at TDS levels greater than about 1000 mg/l. The presence of
high levels of TDS may also be objectionable to consumers, owing to excessive scaling
in water pipes, heaters, boilers and household appliances.