Since the pipe is corrosion. Therefore, it must be changed every 10-15 years, that is, hide the floor, replace the pipes and again close the floor. Here with the advent of polymer or, as the people say, plastic pipes themselves replacing the pipes are not familiar, that is, these pipes did not touch so often. In addition, this technology of the inverted floor has become much more accessible to the usual worker of the country, because polymer pipes are cheaper than iron.