Self cleaning pre filter ring seal type PR100 with skimmer and non return valve
Product information
The PURAIN Rainwater filter, also known as the hydraulic jump filter, cleans itself automatically. The design model for the PU RAIN Rainwater filter comes from nature: at almost every course in a stream, you can see how the hydraulic jump functions. The water flows over one of the stones which has been smoothed and rounded by the erosion from the water over time. The water flow is substantially changed by the high drop from a sub-critical into a super-critical flow. At the bottom of the dip, the waterflow changes back to a sub-critical flow in a process now commonly known as hydraulic jump.