Hayward Pool Sand Filters

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Pollutants in Water Many other chemicals are added to our tap water before we drink it. At the very least this will include fluoride. Ground water - which is heavily saturated with suspended matter and dissolved acids (which give it the brown colour). To clear this water, aluminium sulphate (alum) is added as a coagulant and then chemical polyelectrolytes are added to further settle the coagulated wastes. This water is then passed through sand filters to remove the settled particles. Some of the chemicals remain in the water. This water is then added to the scheme water. Other pollutants also seep in.
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