People with hypertension or high blood pressure should consult their doctor about personal health risks associated with drinking softened water because of the added sodium. The water is cleared by sand, filter paper, compressed glass wool, or other straining material. Mechanical filtration does not do much to remove harmful, dissolved chemicals. Also, it removes hydrogen sulfide and dissolved iron and manganese when followed by mechanical filtration or an activated carbon filter. During chlorination, a pump feeds chlorine into the water.
Chlorine has a residual effect, which means it works for a while after being added to the water.
But if the system is not operated properly, it is expensive and possibly toxic. Also, chlorination byproducts may be harmful. 45N. Ultraviolet radiation removes bacteria and other microbiological contaminants. Water passes a special light bulb where ultraviolet radiation kills contaminants. However, this system may not work effectively in cloudy water or when the water flow is too fast.