The floating intake filter is suitable for sucking in water that has not been pre-cleaned, for example from open waters or wells. WISY floating filters are available as fine filters (0.3 mm mesh size) or as coarse filters (1.2 mm mesh size). Versions with a non-return valve for suction pumps or without a non-return valve for submersible pressure pumps are also available.

The optionally integrated non-return valve prevents the hose from running dry when connected to a suction pump. The floating ball is made of environmentally compatible 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 permanently fully functional. The grommets also have a bead to securely fasten the hose.

Note: Flex hose can only be used with suction pumps that are controlled by an automatic switch with non-return valve ! Expansion vessels only with pressure switch are not suitable!

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Technical data

Intake fine filter with 0.3 mm mesh size (SAFF and FAFF) Filter surface Height
and diameter Ø
Floating ball Ø (floating version)
Intake 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
Intake fine filter with 1½" connection 800 cm² 170 mm
Ø 220 mm
Ø 220 mm
Intake fine filter with 2" connection 1,100 cm² 235 mm
Ø 220 mm
Ø 220 mm
Intake coarse filter with 1.2 mm mesh size (SAGF and FAGF) Filter surface Height
and diameter Ø
Floating ball Ø (floating version)
Intake coarse filter with 1" connection 165 cm² 110 mm
Ø 60 mm
Ø 150 mm
Intake coarse filter with 1¼ connection 165 cm² 110 mm
Ø 60 mm
Ø 150 mm
Intake coarse filter with 1½" connection 380 cm² 150 mm
Ø 100 mm
Ø 150 mm
Intake 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" spout 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° bend 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" male thread SZ 9936 SZ 9928
Floating suction filter with hose-protecting 1½" spout. - SZ 9990
Floating suction filter with 1½" male thread SZ 9930 -
Floating suction filter with hose-protecting 2" spout. - SZ 9991
Floating suction filter with 2" external 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" female spout: 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" female 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 intake filter with 1" external thread SF 0300 SG 0331
Fixed intake filter with 1" internal thread - SG 0351
Fixed intake filter with male thread 1¼" and 90° brass elbow SF 9921 -
Fixed intake filter with 1¼" external thread - SG 0332
Fixed intake filter with 1½" external thread - SG 0333
Permanently mountable intake filter with 2" external thread - SG 0333

Floating intake 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 intake filters has only a low flow resistance and thus ensures that the pump's performance can be fully developed . The rounded, hose-protecting spout with its additional bead ensures permanent function and secure hold of the hose even with frequent up and down movement.

Rainwater intake filter
Rainwater intake filter

Coarse or fine filtration

All intake filters have a stabilised filter mesh made of stainless steel. A choice can be made between coarse or fine mesh size.

  • Fine filters (0.3 mm mesh size) are used for direct water extraction from open waters 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 intake 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.

Fixed intake filters for submersible pumps

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

Intake filter

Intake filters for large systems

WISY's floating intake 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 plant operation .

The intake 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 plants and industrial processes.

Check valve 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.

Multimat Zecihnung

Check valve

Submersible pump with floating suction filter

In the set

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

Rainwater intake filter