Filter Collector FS / STFS
for Process Water or Rainwater

  • for
    Downpipes in detached and semi-detached homes
    Process water in industrial applications

  • Clear Rainwater for toilet flushing, washing machine, house cleaning and garden irrigation

  • Stainless Steel

  • Filter Collector FS:
    Roof areas up to 150 m² or 1,615 sq.ft.
    (tropical climate: 75 m² or 807 sq.ft.)

  • Standpipe Filter Collector:
    Roof areas up tor 200 m² or 2,153 sq.ft.
    (tropical climate: 100 m² or 1,076 sq.ft.)


Operating principle and applications

The filter collector is installed in the vertical rainwater downpipe. It filters the runoff rainwater from the roof before discharging the filtered water through the outlet connection 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 through the downpipe 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. The filter insert is optionally available with the larger mesh size 0.44 mm.

Filtering capacity

The maximum flow rate through the filter collector is 4.2 litres per second (depending on the capacity of the downpipe). 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 filter collector meets the requirements defined by EN 12056 / EN 752 and also conforms to DIN 1989. The hydraulic efficiency of the filter is excellent. With an inflow rate of 2 litres per second, for example, 90 % of the inflowing water is harvested as filtered water.

Housing: 2 versions available:

1. Filter Collector FS for the downpipe

This version can be fitted anywhere in the downpipe. To install the filter collector, a section measuring 32 cm must be cut out of the downpipe and replaced by the filter collector. A projected roof area of 150 m² (1615 sq.ft.) can by drained by this version of the collector. The housing is available in stainless steel, copper or zinc so that it can be visually harmonised with the existing downpipe.

2. Standpipe Filter Collector STFS as a standpipe

WISY can supply the standpipe filter collector as a replacement for the standard cast iron section at the base of each rainwater downpipe. With this version, the filter collector is designed to look like a downpipe. The filtered water outlet is below ground level. The generous dimensions of this version increase its collection capacity so that it is capable of draining projected roof areas of up to 200 m² (2,153 sq.ft.) in size.

Both versions are frost-proof and corrosion-resistant. Stainless-steel filters can be installed in downpipes made of zinc, copper or plastic without risk of galvanic action. The filters are available to fit various sizes of commercially available rainwater downpipe.

Easy to maintain — low-maintenance design

All WISY filter inserts are designed for very low maintenance. It is virtually impossible for debris or dirt to stick to their smooth, stainless-steel surface. As a result, the filter inserts have a long service life.

Since the filter insert of both versions of the filter collector is always above ground level, it is easily accessible and protected against backflow in the sewer system. When necessary, the insert can be removed from the housing in just a few simple steps for cleaning by a high-pressure cleaner or in the dishwasher.

Item number

For metall downpipes Da = external-Ø downpipe Mesh-size 0,28 mm Mesh-size 0,44 mm
Stainless steel housing
FS 100 VA (DN) 100, Da 102 mm FS 0303 FS 0433
FS 87 VA (DN) 87, Da 89 mm FS 0302 FS 0432
FS 80 VA (DN) 80, Da 80 mm FS 0301 FS 0431
FS 76 VA (DN) 76, Da 76 mm FS 0305 FS 0435
Zinc housing
FS 100 ZN (DN) 100, Da 102 mm FS 0103 FS 0413
FS 87 ZN (DN) 87, Da 89 mm FS 0102 FS 0412
FS 80 ZN (DN) 80, Da 80 mm FS 0101 FS 0411
FS 76 ZN (DN) 76, Da 76 mm FS 0105 FS 0415
Copper housing
FS 100 CU (DN) 100, Da 102 mm FS 0203 FS 0423
FS 87 CU (DN) 87, Da 89 mm FS 0202 FS 0422
FS 80 CU (DN) 80, Da 80 mm FS 0201 FS 0421
FS 76 CU (DN) 76, Da 76 mm FS 0205 FS 0425
For plastic downpipes
Stainless steel housing
FS 110 VA (DN) 100, Da 110 mm FS 0304 FS 0434
FS 76 VA (DN) 70, Da 75 mm FS 0305 FS 0435
Copper housing
FS 110 VA (DN) 100, Da 110 mm FS 0204 FS 0424
FS 76 VA (DN) 70, Da 75 mm FS 0205 FS 0425