Replacing cast iron sewage on plastic lover Overhaul in the apartment should be carried out with the study of the state of sewage pipes. For a long time during the construction of houses for these purposes, cast -iron pipes were used. Cast iron itself is very durable. And in some places the pipe from cast iron stood for more than a hundred years. But this is only if they were covered with enamel. Enameled cast -iron pipes differ from the usual purity of the inner surface. And this prevented sticking on the walls of various deposits from drains. But if there is an opportunity, then during major repairs, any cast -iron pipes, even sunbeds, even risers, are better to replace with plastic.