Treatments to Ensure Water Quality
Two of the most feasible ways of solving the problem of biological contaminants in water supplies are by the addition of chlorine to the water or the use of ultraviolet radiation.
Chlorine : chlorine is generally the most common way of treating water.
Perhaps the best benefit of this method is that the chlorine produces a residue which will remain in the water after the initial addition of the chemicals.
However, the downfall of chlorine is that it must be monitored and when the level of chlorine drops below the specific amount, more must be added. The human error involved with this can sometimes produce either an overdose of chlorine or an effective under dose if there is not enough present to neutralize the contaminants.
Ultraviolet radiation is safe. There have been some fears that radiation lingers in the water, but this is not true. The beam of UV energy is stationary and as the water flows past it the bacteria and insects are killed. This is a very effective means of treatment.
However, the drawback to UV radiation is that once the water passes through the beam there is nothing to prevent contaminants from reentering the water supply. When using UV radiation no residue is produced so there is no way of preventing the proliferation of foreign materials.