PURAIN INNOVATION
& TECHNOLOGY

Hydraulic Jump

PURAIN filters capture every single drop of water up to a high rainfall rate. When a heavy rain comes, the hydraulic jump with patented self-cleaning technology quickly flushes any accumulated debris out. This makes the PURAIN filter super reliable and assures outstanding water quality with more water in the tank.

Minimal Elevation Loss

All PURAIN filters have elevation loss of less than 1 pipe diameter. This also allows for in-tank installation to provide many additional benefits.

Heavy Duty Construction

The 8” to 16” filters have a heavy-duty option for direct burial, meaning the added cost of a vault is eliminated. With their very sturdy and robust construction, PURAIN reaches the deepest direct burial depth (without a vault) of any leading rainwater inlet pre-filter with up to 7’6” depth and 60-ton vehicle loading possible.

Smart Design

Easy installation minimizes costs in any configuration. You can install PURAIN filters easily inside the tank, outside the tank, directly buried, even for retrofits. Easy connections make installation a breeze.

800 Micron Wedge Durable Stainless Steel Wire Screen

The PURAIN screen meets ASPE/ARCSA 63 standards and delivers higher flow of clean water to the tank than the other leading self-cleaning filters. Its trapezoidal shape and diagonally set profile prevents debris from settling and clogging it. The robust screen is durable and never needs replacing.

Integrated Non-Return Valve and Small Animal Protection in 4” Model

The design of PURAIN 4” features a non-return valve which stops small animals and mosquitos from entering the tank.

Integrated Overflow Skimmer

The 4” and 6” PURAIN filters have an integrated skimmer to assure great water quality in the tank. Floating debris such pollen is skimmed away from the water surface through the side pockets. From here, the debris is directly channeled out to overflow and wastewater connection. The overflow skimmer adds a further cleaning process to the tank water.

purain rainfall diagram
purain efficiency diagram