The GRS stainless steel garden rainwater collector is equipped with a filter insert and is available for round downpipes with different diameters. The filter insert has a height of 10.5 cm and a mesh size of 0.44 mm. The outlet spout has a diameter of DN 50 .

The rainwater collector has automatic overflow protection and is winterproof because it is made of stainless steel. It is specially designed for use with a rain barrel in the garden and is installed in the downpipe . The outlet spout is to the rain barrel and also has a diameter of DN 50.

The rainwater collector complies with the drainage standards DIN EN 12056 and fulfils the requirements of DIN 1989. It can be supplied optionally with or without a filter insert, whereby the filter insert is extremely low-maintenance and is easy to clean . Cleaning is recommended at an interval of 2 to 3 times a year .

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Function and field of application

The garden rainwater collector is installed in the vertical downpipe. It filters rainwater from the downpipe and directs it sidewards to the cistern. Due to its design, it needs particularly little maintenance: leaves, dirt and other washed-up debris fall through and are flushed down the drain. The filter result is optimally adapted to the needs of garden irrigation. The garden rainwater collector is also available without a filter insert.

Filter capacity

The flow through the garden rainwater collector can be up to 4.2 l/s, corresponding to the capacity of the downpipe. As in all WISY filters, the open cross-section of the roof drainage is maintained throughout the whole unit. There are no constrictions of the cross-section where rainwater can accumulate. Not even in the case of cloudburst-like rainfall. Drainage safety according to DIN EN 12056 / EN 752 is always guaranteed, DIN 1989 is fulfilled. At the same time, the filter has a high hydraulic efficiency. At an inflow of 1.5 l/s, for example, 90 % of the incoming water is filtered and can be stored.

Automatic overflow

When mounted at the correct height, the garden rainwater collector is an automatic overflow for the rain barrel. As soon as the barrel is full, it directs further water to the drain or to infiltration. Overflowing is impossible.

Resistant housing

The housing of the garden rainwater collector is made of stainless steel. It is inserted into the downpipe. Of course, it is frost and corrosion resistant and can also be installed in downpipes made of zinc, copper or plastic without galvanic interaction. Different connection Diameters allow a simple and easy installation.


All WISY filter inserts are designed to need particularly little maintenance. Their smooth stainless steel surface makes it almost impossible for impurities to settle. Because it is positioned above ground level, the garden rainwater collector is easily accessible and protected against backwater in the sewer system. If necessary, the filter insert can easily be removed from the housing and put into the dishwasher for cleaning .

Article number

For metal downpipes Da = outer Ø downpipe without filter insert with filter insert 0.44 mm
GRS 100 VA (DN) 100, Da 102 mm 15701 15711
GRS 87 VA (DN) 87, Da 89 mm 15702 15712
GRS 80 VA (DN) 80, Da 80 mm 15703 15713
GRS 76 VA (DN) 76, Da 76 mm 15704 15714
For plastic downpipes
GRS 110 VA (DN) 100, Da 110 mm 15705 15715
GRS 76 VA (DN) 70, Da 75 mm 15704 15714

matching Accessories

Stabilix rainwater barrel 500 l Stabilix rainwater barrel 500 l
Rainwater barrel connection hose
Blind insert for FS, STFS, RS, GRS and WFF Blind insert for FS, STFS, RS, GRS and WFF
Filter collector FS Filter collector FS

Other Downpipe filters

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Rain collector RS Rain collector RS
RainCatcher RC RainCatcher RC
Garden rainwater set Garden rainwater set