For the construction of the septic tank in their country area, the owners also use reinforced concrete rings. Of these, two communicating wells are built, which are subsequently closed with a special cast lid. It is known that the purchase of a septic tank made of modern plastic is a very costly event. That is why reinforced concrete rings are used by inhabitants for the independent structure of the local sewage system. DIY septic tank is as highly functional as a plastic device. Reinforced concrete rings are indispensable in the process of human life. They are very popular among consumers, since today they have no worthy replacement.