It is aimed

In its appearance, the sewage system can be: the internal, the principle of operation of which, is that it allows you to collect all the drains from one building and remove them to the external sewer system. External sewage system, it is aimed at the general collection of all the drains and their removal to the place where they are discharged into the water intake. Pay special attention to the material from which the sewer system is made. The choice of materials in this case is very responsible, because the level of the aggressiveness indicator of the tolerated drains in terms of its indicators is very high. The building material, which is most trusted with the manufacture of sewer pipes of cast iron, polyethylene, there are almost no products for sewage made of glass or ceramics.