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- Packaged Systems
The GRAF In-Ground Pre-Cistern Roofwasher Basket Filter is a low-cost, effective pre-tank filter designed for maximum water yield with larger residential/smaller industrial roofs (up to 5,500 sq ft). Manufactured from high-density polyethylene, the GRAF filter is light-weight and easy to manage when being installed. Several field-adjustments are available; the filter comes ready for 4" connections, but cut back the stub-outs on the pre-formed cut line to make the filter ready to receive 6" pipe connections. With a telescoping/adjustable riser, the filter can be easily manipulated to match existing installation elevations.
If you are looking to install a drinking water system in Ohio from rainwater collection, please note that, in accordance with Ohio Private Water Systems Regulations (via the Ohio Health Department), one roofwashing filter must be installed per every 1,500 sq ft of collection surface (roof area). Please contact us if you would prefer to use this roofwasher and we will contact your county's health department to explain this particular roofwasher to try to get a variance since this unit will filter larger roof areas. You may also want to check out our Concrete Roofwasher for your installation.