The dissolved solids in the pool may be due to body wastes, suntan lotion,stabilizer,chlorine, algicide, dirt , dust, pollen etc.
Since this is an outdoor pool, the TDS value is less than usual because of dilution by rainwater.
TDS increases with conductivity as the more salts are dissolved in the water; the higher is the electrical conductivity. The majority of solids, which remain in the water after a sand filter, are dissolved ions. Sodium chloride for example is found in water as Na+ and Cl-. High purity water that contains in the ideal case only H2O without salts or minerals has a very low electrical conductivity. The water temperature affects the electric conductivity so that its value increases from 2 up to 3 % per 1 degree Celsius.
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