A 20-inch extension tube for the WISY Low Capacity Vortex Fine Filter, used to raise the inspection opening to ground level. The WISY Low Capacity Vortex Fine Filter is used in installations where multiple downspouts are connected to a single pipe into the vortex filter. A single unit can filter precipitation from a roof area up to 2,150 square feet for site irrigation, toilet and urinal flushing, janitorial use, laundries, fire protection, evaporative cooling tower make-up, process water, or other non-potable uses. The filter is typically installed in the underground piping system to direct debris to the stormwater system and divert up to 95% of clean rainwater to an underground storage tank.

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