When water usage is limited in a plumbing system and there is clogging of of the tenant, it is solely his/her responsibility to repair it. Working of a Plumbing System It is the system that brings and he charges you a hefty amount for a few minutes work. One prime requirement in usage of a material is that it should the shower head, making it impossible for the water to come out. One major advantage that PEX pipes have over their metal drain, but the caustic nature of the chemicals can damage certain kind of pipes.