It was not until the dawn of the 21st century we have become aware of the importance of preserving the environment both for ourselves and for generations to come. Water is a natural phenomenon and is the most common substance in the structure of all living beings and covers most of the earth's surface, even 70.8% and 29.2% of the land. Water is the source of life and irreplaceable natural resource. Any use of water from various water supply systems for different purposes there is a change of its physical, chemical and biological properties and the resulting waste water was industrial, household, agricultural or storm. Such water should be collected and are a convenient way to clean up and take the receiver with no adverse effects on the environment. Lately, more and more companies engaged in the development, production and delivery of technologies for waste water treatment. All the important waste water treatment and construction of purification at the end of the city's sewage system and especially in the context of the plant before being discharged into the city sewer system. It is also important to know the type and composition of the waste water in order to be applicable to the needs of an appropriate purification process and achieve a better result.