PURAIN Pre-Filter for Rainwater and Greywater
Hydraulic jump filters with self-cleaning technology for maximum water capture.
Self-cleaning PURAIN inlet pre-filters have the highest rainwater capture of clean rainwater with exclusive hydraulic jump technology patented by INTEWA. PURAIN filters are also used in greywater applications. For rainwater applications, PURAIN filters capture every single drop of water up to a high rainfall rate (97% rain falls at low flow rate). In greywater applications, the filter screen is automatically cleaned with the help of a backwash nozzle.
PURAIN filters offer connection sizes from 4" (DN100) to 16" (DN400) for installation direct buried below grade, inside a tank, or externally mounted.
With PURAIN filters, the incoming water is filtered by gravity through a stainless-steel trapezoidal sieve into the cistern. Debris collects in a depression behind the sieve until it is flushed to the overflow by hydraulic jump which happens during a heavy rain event.
Technology
Minimal Elevation Loss
All PURAIN filters have elevation loss of 1 pipe diameter.
Smart Design
Easy installation and low maintenance minimizes costs in any configuration. You can install PURAIN filters inside a tank, outside the tank, directly buried, even for retrofits.
Heavy Duty Construction
The 6" to 16" filters have a heavy-duty option for direct burial. Thanks to ist very sturdy and robust construction, PURAIN filters reach very deep direct burial depth (without a vault).
800 Micron Wedge Wire
The PURAIN stainless screen meets ASPE/ARCSA 63 standards and delivers high flow of clean water thanks to its trapezoidal shape.
PURAIN 8” to 16” for Commercial Applications
This PURAIN product line is developed for in-tank installations or wall mounting. The filters are sized for pipe diameters of 8”, 12”, and 16” SDR 35 PVC.
PURAIN HD 8” to 16”: Heavy Duty Commercial Direct Bury Application
The PURAIN HD line is designed for underground installation with a vehicle rating up to 60 tons. These filters are accessible with conventional manhole lids and concrete rings, and they are sized for pipe diameters of 8”, 12”, & 16” SDR 35 PVC.
PURAIN 6” and 8”: Large Roofs and Grey Water Recycling Applications
This PURAIN model is the most versatile and cost effective. The injection molded filter can be buried, mounted inside the cistern, or mounted externally.
PURAIN 4″: Small Roofs and Greywater Recycling Applications
Ideal for small single-family houses, the PURAIN (4”) includes a non-return valve, small animal protection, and skimmer overflow.
PURAIN SIZING
PURAIN comes in a wide range of inlet sizes from 4" to 16". The correct size is based on local rainfall intensity and roof square footage. See the color-coded sizing chart by roof size and geography in our Technical Library.
Download Technical Library