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The floating intake coarse filter is suitable for drawing in pre-cleaned water, for example from cisterns, rainwater storage tanks or closed containers. The coarse filter has a mesh size of 1.2 mm. Versions with non-return valve for suction pumps or without non-return valve for underwater pressure pumps are available.

The optional integrated non-return valve prevents the hose from running dry when connected to a suction pump.

The floating ball is made of environmentally friendly polyethylene, while all other parts are made of stainless steel .


The grommets on the floating filters are rounded to protect the hose. Even with frequent up and down movement of the floating ball in the rainwater storage tank, the hose remains fully functional at all times . The grommets also have a bead to securely fasten the hose.

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Coarse or fine filtration

All suction filters have a stabilised filter mesh made of stainless steel. You can choose between coarse or fine mesh sizes.

  • Fine filters (0.3 mm mesh size) are used for drawing water directly from open bodies of water such as rivers, ponds or wells.
  • Coarse filters (1.2 mm mesh size) are suitable for pre-filtered water from cisterns, rainwater storage tanks and other closed containers.

The use of suction filters significantly increases the operational reliability of the system . The filters prevent dirt particles and impurities from entering the pump, which significantly reduces wear on the pump and clogging of the valves .
Intake filter

Suction filters for large systems

WISY's floating suction filters are available for large systems with up to 2" connection. They offer an efficient solution for optimising water treatment. Their simple design allows easy installation and maintenance for smooth system operation .

The suction filters with large connection cross-section are reinforced with additional struts to withstand the volume flow of large pumps. Therefore, they are ideal for applications in large units and industrial processes.

Floating suction filters

The float allows the suction point to rise and fall with the water level. This draws the water from the cleanest area of the cistern. Greasy and light debris collects on the surface of the water, where it regularly drains away via the overflow. Sand and heavy particles collect in the bottom sediment.

The large surface area of the floating suction filters has only a very small flow resistance and thus ensures that the pump's performance can be fully developed . The rounded, hose-protecting nozzle with its additional bead ensures permanent function and secure hold of the hose even with frequent up and down movement.

Rainwater intake filter
Fixed intake fine filter, WISY SF 9921

Fixed mountable suction filters for submersible pumps

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

A non return valve is mandatory for suction pumps

The connection nozzle of the floating suction filters is available with an optional non-return valve (=backflow preventer). When using a suction pump , it ensures that a water column always remains in the hose and does not have to build up again every time the pump is started.

Selected suction filters are also available as a set with hose and connection for the submersible pump or PE pipe.

AspriPlus suction pump for rainwater, WISY system drawing

Non return valve

Suction pump pump with floating suction filter with non return valve

In the set

Selected suction filters are also available as a set with hose and connection for the submersible pump or PE pipe.

Rainwater intake filter

Related products

Floating fine suction filter
€130.90*
Floating fine suction filter for large systems
Variants from €415.31*
€451.01*
Floating fine suction filter as a set
Variants from €160.65*
€172.55*

Technical data

Suction fine filter with 0.3 mm mesh size (SAFF and FAFF) Filter surface Height
and diameter Ø
Floating ball Ø (floating version)
Suction fine filter with 1" connection 380 cm² 120 mm
Ø 120 mm
Ø 150 mm
Fine suction filter with 1¼" connection 380 cm² 120 mm
Ø 120 mm
Ø 150 mm
Suction fine filter with 1½" connection 800 cm² 170 mm
Ø 220 mm
Ø 220 mm
Suction fine filter with 2" connection 1,100 cm² 235 mm
Ø 220 mm
Ø 220 mm
Suction coarse filter with 1.2 mm mesh size (SAGF and FAGF) Filter surface Height
and diameter Ø
Floating ball Ø (floating version)
Suction coarse filter with 1" connection 165 cm² 110 mm
Ø 60 mm
Ø 150 mm
Suction coarse filter with 1¼ connection 165 cm² 110 mm
Ø 60 mm
Ø 150 mm
Suction coarse filter with 1½" connection 380 cm² 150 mm
Ø 100 mm
Ø 150 mm
Suction coarse filter with 2" connection 380 cm² 150 mm
Ø 100 mm
Ø 150 mm

Article number

Floating suction filters for suction pumps WITH non-return valve Fine filter (SAFF with 0.3 mm mesh) Coarse filter (SAGF with 1.2 mm mesh)
Floating suction filter with hose-protecting 1" nozzle and non-return valve SZ 9924 SZ 9915
Floating suction filter with hose-protecting 1¼" nozzle and non-return valve SZ 9925 SZ 9916
Floating suction filter with hose-protecting 1½" nozzle and non-return valve - SZ 9917
Floating suction filter with hose-protecting 2" nozzle and non-return valve - SZ 9918
Set of 2 m highly flexible suction hose on floating suction filter with hose-protecting 1" nozzle, non-return valve, stainless steel hose clamp and 1" PE screw connection with 90° brass elbow SZ 98 01 SZ 98 11
Set of 3 m highly flexible suction hose on floating suction filter with hose-protecting 1" nozzle, non-return valve, stainless steel hose clamp and 1" PE screw connection with 90° elbow SZ 98 02 SZ 98 12
Floating suction filters for underwater pressure pumps WITHOUT non-return valve Fine filter (SAFF with 0.3 mm mesh) Coarse filter (SAGF with 1.2 mm mesh)
Floating suction filter with hose-protecting 1" nozzle SZ 9935 SZ 9927
Floating suction filter with 1" outside thread SZ 9936 SZ 9928
Floating suction filter with hose-protecting 1½" nozzle. - SZ 9990
Floating suction filter with 1½" outside thread SZ 9930 -
Floating suction filter with hose-protecting 2" nozzle. - SZ 9991
Floating suction filter with 2" outside thread SZ 9931 -
Set for submersible pumps with 1" nozzle: Floating suction filter with hose-protecting 1" nozzle on 1 m highly flexible suction hose SS 9935 SS 9905
Set for submersible pumps with 1¼" inside thread at suction side: Floating suction filter with hose-protecting 1" nozzle on 1 m highly flexible suction hose SS 9931 SS 9901
Set for submersible pumps with 1¼" inside threaded connection: Floating suction filter with hose-protecting 1¼" nozzle on 1 m suction hose SS 9932 SS 9902
Suction filter for fixed mounting on submersible pressure pumps Fine filter (FAFF with 0.3 mm mesh) Coarse filter (FAGF with 1.2 mm mesh)
Fixed suction filter with 1" outside thread SF 0300 SG 0331
Fixed suction filter with 1" inside thread - SG 0351
Fixed suction filter with outside thread 1¼" and 90° brass elbow SF 9921 -
Fixed suction filter with 1" outside thread - SG 0331
Fixed suction filter with 1¼" outside thread - SG 0332
Fixed suction filter with 1½" outside thread - SG 0333
Fixed suction filter with 2" outside thread - SG 0334