Suction Filter

  • Protection of pump and rainwater unit
  • Two mesh sizes available
  • Fixed or floating filters
  • Non-return valve
  • Kit with connecting hose

Overview

Operating principle and applications

The suction filter is connected upstream of the pump in the storage tank. Floating and fixed suction filters are available. Two mesh sizes can be selected (for coarse or fine filtering). The operational reliability of a rainwater harvesting system is significantly enhanced by the suction filter which helps to reduce pump wear and prevent clogging of valves.

Coarse and fine filter mesh

All suction filters consist of a stabilised, stainless-steel filter mesh. Two mesh sizes are available, i.e. a 1.2 mm mesh for coarse filtering and a 0.3 mm for fine filtering. The coarse mesh is suitable for use with pre-filtered water from storage tanks and other enclosed vessels. The fine filter mesh can be used for unfiltered water from open waters.

Feines und grobes Filtergewebe des WISY Ansaugfilters im Vergleich

Fixed suction filters for submersible pumps

Fixed suction filters are directly connected to the submersible pump without connecting hose or float. They are available with coarse or fine filter mesh.

Ansaug-Grobfilter mit schlauchschonender WISY-Tülle

Floating suction filters

Thanks to the float, the suction point changes with the water level in the tank. As a result, water is extracted from the cleanest part of the tank. Grease and light particles of dirt collect on the water surface where they are regularly flushed away through the overflow. Sand and heavy dirt particles are deposited in the sediment on the tank base.

The large surface area of the floating suction filter ensures free, unhindered inflow of water so that the pump can operate with optimum efficiency. The rounded hose nozzle with its flared collar ensures reliable operation and secure attachment of the hose even when the floating filter frequently shifts position with the water level in the tank.

Kit with connecting hose for floating suction filters

Selected floating suction filters are also available as a kit with hose and connection for the submersible pressure pump or the PE tube to the suction pump.

Non-return valve (optionally available for floating suction filters)

The connection nozzle of the floating suction filter is optionally available with non-return valve. In systems with a suction pump, the non-return valve maintains the water column in the hose so that the pump does not need to reprime itself every time it starts.

Technical Data

Fine Suction Filter (SAFF und FAFF) Filter surface area Filter height
and diameter Ø
Float diameter Ø
(floatable version)
Fine Suction Filters with 1" connection 380 cm² (58.9 in²) 120 mm (4.7 in)
Ø 120 mm (4.7 in)
Ø 150 mm (5.9 in)
Fine Suction Filters with 1¼" connection 380 cm² (58.9 in²) 120 mm (4.7 in)
Ø 120 mm (4.7 in)
Ø 150 mm (5.9 in)
Fine Suction Filters with 1½" connection 800 cm² (124 in²) 170 mm (6.7 in)
Ø 220 mm (8.7 in)
Ø 220 mm (8.7 in)
Fine Suction Filters with 2" connection 1,100 cm² (170.5 in²) 235 mm (9.3 in)
Ø 220 mm (8.7 in)
Ø 220 mm (8.7 in)
Coarse Suction Filter (SAGF und FAGF) Filter surface area Filter height
and diameter Ø
Float diameter Ø
(floatable version)
Coarse Suction Filters with 1" connection 165 cm² (25.6 in²) 110 mm (4.3 in)
Ø 60 mm (2.4 in)
Ø 150 mm (5.9 in)
Coarse Suction Filters with 1¼" connection 165 cm² (25.6 in²) 110 mm (4.3 in)
Ø 60 mm (2.4 in)
Ø 150 mm (5.9 in)
Coarse Suction Filters with 1½" connection 380 cm² (58.9 in²) 150 mm (5.9 in)
Ø 100 mm (3.9 in)
Ø 150 mm (5.9 in)
Coarse Suction Filters with 2" connection 380 cm² (58.9 in²) 150 mm (5.9 in)
Ø 100 mm (3.9 in)
Ø 150 mm (5.9 in)
...

Item number

Floating suction filter Fine filtering Coarse filtering
With non-return valve for suction pumps (0,3 mm mesh size) (1,2 mm mesh size)
1" hose nozzle SZ 9924 SZ 9915
1 1/4" hose nozzle SZ 9925 SZ 9916
1 1/2" hose nozzle - SZ 9917
2" hose nozzle - SZ 9918
Without non-return valve for submersible pumps
1" hose nozzle SZ 9935 SZ 9927
1" external thread SZ 9926 -
1 1/4" hose nozzle SZ 9936 SZ 9928
1 1/2" hose nozzle - SZ 9990
1 1/2" external thread SZ 9930 -
2" hose nozzle - SZ 9991
2" external thread SZ 9931 -
Kits with floating suction filter
Kits with non-return valve for suction pumps
Kit with 2 m (6.56 ft) suction hose, suction filter (1“), 90° elbow and 1“ pipe connection SZ 98 01 SZ 98 11
Kit with 3 m (9.84 ft) suction hose, suction filter (1“), 90° elbow and 1“ pipe connection SZ 98 02 SZ 98 12
Kits without non-return valve for submersible pumps
Kit for 1“ hose nozzle with suction filter (1“), 1 m (3.28 ft) suction hose and pump connection SS 9935 SS 9905
Kit for 1 1/4" inside thread with suction filter (1“), 1 m (3.28 ft) suction hose and pump connection SS 9931 SS 9901
Kit for 1 1/4“inside thread with suction filter (1 1/4“), 1 m (3.28 ft) suction hose and pump connection SS 9932 SS 9902
Fixed suction filter
Fine filtering (FAFF)
Standard version, 1" external thread SF 3000 -
Standard version, 1 1/4" external thread, 90° brass elbow SF 9921 -
Extended slimline version, 1" external thread, 90° elbow SF 9924 -
Coarse filtering (FAGF)
1" external thread - SG 0331
1" inside thread - SG 0351
1 1/4" external thread - SG 0332
1 1/2" external thread - SG 0333
2" external thread - SG 0334

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