Surprisingly, but very often, a tap water purification might become quite complicated and expensive problem. The thing is that traditionally, at water treatment plants, drinking water at once passes several stages of purification with chlorine-containing reagents. The source water always contains dissolved organic compounds that comes into reaction with chlorine forming a new class of substances, which could never be found in natural water - organochlorine compounds. These include such well-known substances as: chloroform, dichloroethane and huge number of less-known - trichloromethane, carbon tetrachloride, perchloroethylene etc.
The organochlorine compounds are extremely toxic and are almost always carcinogenic. The most poisonous and well-known to man substance - dioxin, also belongs to the organochlorine compounds class. According to modern research, any concentration of dioxin is dangerous. Even its single molecule could cause the oncological disease. The organochlorine compounds in drinking water are one of the most significant factors that provoke a growth of the oncological disease lately. Even if you don't drink a chlorinated water, these compounds could be absorbed through the skin causing the same consequences. So, it just so happens that technology of water chlorination, which saved millions of lives in the twentieth century, now has become increasingly significant factor in the growth of cancer.
It is quite difficult to get rid of the organochlorine compounds. They are difficult to treat by the methods of oxidation and adsorption. Besides, application of adsorption technology that is so popular in home tap water purification systems, has one major drawback - the unpredictability of the filter impregnation moment. Because the concentration of organochlorine and organic impurities in the tap water is not stable, it is impossible to estimate the moment of impregnation of the adsorption filter. Without analysis in the lab, it is impossible to determine a time when the filter already became impregnated and breakthrough of the adsorbed impurities have began, so, perform the analysis every day is not a very convenient thing.
At present, the most promising complex solution of the problem of tap water afterpurification is a technology of intensive oxidation developed by ECOZONE Company. This technology is based on the ozonizing and ultraviolet irradiation of water simultaneously. The reaction rates of ozone with organochlorine compounds are very low, and with some substances (eg carbon tetrachloride) it virtually doesn't reacts at all. The molecule of ozone dissociates under ultraviolet radiation and generates an active OH particle, which, as opposed to the ozone, instantly reacts with organochlorine compounds, oxidizing them with formation of chlorides (table salt). This technology is efficient and safe and does not require consumable items and reagents. The intensive oxidation units for tap water purification are extremely compact and easy to install under the sink or on the standpipe of cold water.