Rain Tap Popup Filter is offered in a compact design that makes it flexible to install in varying field conditions. Rain Tap Popup Filter is installed at the bottom end of the down water pipe. Rain Tap Popup Filter is used for the separation of the first flush of rainwater from the relatively cleaner and purer subsequent rain. Rain Tap Popup Filter utilises a filter element which is made of plastic net and mesh to effectively filter rainwater from the roof of a building.