Overview.Materials required and site specification.Materials Required.PVC drum or ferro cementFiltering material – coarse jelly, smaller jelly, sandWire meshOutlet pipe for allowing filtered water to go outOverflow pipe to allow excess water to flow out.Site Specification.Usually placed below vertical down pipeCan also be placed adjacent to sump tank.Note.Filtering material.Placed at the mouth of the rainwater pipe, the filtering material can be very diverse.. A combination of perforated aluminium box with mesh and sand or perforated plastic bottle with mesh and gravel are efficient. .PVC drums.Advantages – light weight, easy to transport, easy installationDisadvantages – cannot be kept in sun, limited capacityCost - around Rs. 600. If kept in the shade, it can last over 6 years.Ferro cement filters .Advantages – size can be made to suit the requirementsDisadvantages – heavy, requires skill for constructionCost - around Rs. 1700.Stainless steel filter.The stainless steel box filter is ready to use.The water enters the box from the top and passes through the mesh to the down flow pipe. Thus, stone and sand filling is not necessary.This filter is easy to cleanA stainless steel filter costs around Rs. 6000.Construction technique.Step 1.Step 2.Step 3.Step 4.Caution.Always keep the filter cleanRemove the mesh after every rain