The WISY Medium 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 500 square meter. 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. An above-grade application is also possible.

The WISY WFF 150 connects to a 6" pipe for above- or belowground storage. A 20-inch extension tube can be used to raise the inspection opening to ground level. The filter housing is made of polypropylene; filter insert is made of stainless steel. Filter mesh size is 0.28 mm 280microns). Filter insert requires cleaning a few times a year and is dishwasher safe. Filter inlet, clean water outlet, and stormwater outlet can swivel for custom installation.

Operating principle and applications

The vortex fine filter 150  is usually installed below ground in the horizontal rainwater pipe. It filters the rainwater that flows in at the side of the filter unit and releases the filtered rainwater to the storage tank. Its filter insert is made of a fine stainless-steel mesh with a mesh size of only 0.28 mm. Leaves, moss and other debris entrained in the rainwater are reliably filtered out and flushed away to the soakaway or drain. 

Rainwater cleansed by this filter is in a perfect condition for tank storage and for subsequent use in the washing machine or for flushing toilets and general household cleaning. It is also ideal for use in sports or equestrian facilities where large playing or riding surfaces need to be irrigated, or where large quantities of soft water are needed for cleaning purposes.

All WISY's vortex fine filters are perfect for filtering process water. They are already successfully deployed in the paper, textile and food industries.

See this video explaining its operation 

Drainage capacity

The WFF 150 is capable of filtering up to 12.8 litres per second. This corresponds to the drainage volume for a projected roof area  500 m² (5382 sq.ft.) (WFF 150)  As with all WISY filters, the cross-sectional area for rainwater flow does not change at any point inside the filter, i.e. to ensure the free flow of water, the cross section is not restricted at any point. There is no risk of blockage even during torrential rainfall events which may flush large quantities of debris into the filter. The vortex fine filter meets the requirements defined by EN 12056 / EN 752 and also conforms to DIN 1989.

Note: Item excludes extension tube