The PURAIN Rainwater filter, also known as the hydraulic jump filter, is the innovation for roof areas ranging from 60m² to more than 15.000m².

This hydraulic jump technology cleans itself automatically. The design model for PURAIN Rainwater filters 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, smooth and rounded by the action of the water over time. The water flow is substantially changed by the height drop, from a sub-critical to a super- critical flow. At the bottom of the dip, the waterflow changes again to a subcritical flow in a process now commonly known as hydraulic jump. This resulting increase in water power forces any impurities over the next level and washes them away downstream.

• PURAIN Rainwater filters for industrial, public or commercial buildings.
• This series is developed for in tank installation, wall mounting or in a separate chamber
• For discharge pipes up to DN300
• L x B x H:                                                        1786 mm x 581 mm x 1281 mm
• Hs Height of shoulder:                                     881 mm
• L 1:                                                                  363 mm
• L 2:                                                                  460 mm
• B 1 Width of dome:                                          295 mm
• D1 Intake:                                                        DN300/Ø315 (LP*)
• D2 Clearwater outlet:                                       DN200/Ø200 (LP*)
• D3 Emergency overflow/ wastewater outlet:    DN300/Ø315 (LP*)
• H1 Intake:                                                        499 mm
• H2 Clearwater outlet:                                       53 mm
• H3 Emergency overflow:                                 228 mm
• Δh Height offset:                                              271 mm
• b Sealing collar:                                               13 mm
• Width of wedge wire filter:                                0.8 mm
• Dimensions of sieve:                                       500 mm x 255 mm
• Efficiency:                                                        98%
• Material:                                                           PE, NBR, Stainless Steel
• Weight:                                                            117 kg