ระบบระบายน้ำฝน - AN OVERVIEW

seven. Consider using reinforcing mesh or steel bars to provide the concrete additional energy and toughness against significant rain or snow masses.PVC: Plumbers have already been using polyvinyl chloride (PVC) as a less expensive choice to cast iron for more than a century now. It can be nontoxic and abrasion-resistant, and is also easier to cut