Rainwater Tank Accessories

Professional rainwater tank accessories benefit water quality within the rainwater harvesting storage tank.

The quality of harvested rainwater within the rainwater storage tank is determined by numerous factors such as the composition and material-nature of the roof as well as the functionality of the pre-tank filtration unit.
Also, the rainwater tank itself is of significance in order to maintain a high-quality standard of the harvested rainwater stored within the tank. Underground subsoil installation of the rainwater tank provides a stable temperature of approx. 8°C - 10°C throughout the year.

In conjunction with the WISY Coarse/Fine Floating Suction Filter connected to the submersible pump, the WISY Smoothing Inlet and WISY Multisiphon ensure only the best water quality is introduced to the rainwater harvesting network.

WISY Smoothing Inlet


The WISY Smoothing Inlet is manufactured in stainless-steel and is installed on the tank base at the end of the vertical inlet pipe from the rainwater filter. Preventing the resuspension of fine sediment on the base of the tank as water enters the storage chamber during precipitation, the WISY Smoothing Inlet functions as a calming inlet and distributes fresh, oxygen-enriched rainwater within the rainwater harvesting tank.

WISY Multisiphon


The WISY Multisiphon is a multi-functional overflow-device which is located within the rainwater tank and connected to the rainwater tank outlet. Due to the skimming-effect fine floating debris on the water surface is effectively removed when the tank reaches the maximum filling level of the rainwater tank. The continuous water barrier within the overflow-device seals against potential odours from the connected stormwater-drain or mixed municipal wastepipe. The WISY Multisiphon is also available with drain-backflow prevention and vermin-protection.

Professional rainwater tank accessories benefit water quality within the rainwater harvesting storage tank. The quality of harvested rainwater within the rainwater storage tank is determined... read more »
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Rainwater Tank Accessories

Professional rainwater tank accessories benefit water quality within the rainwater harvesting storage tank.

The quality of harvested rainwater within the rainwater storage tank is determined by numerous factors such as the composition and material-nature of the roof as well as the functionality of the pre-tank filtration unit.
Also, the rainwater tank itself is of significance in order to maintain a high-quality standard of the harvested rainwater stored within the tank. Underground subsoil installation of the rainwater tank provides a stable temperature of approx. 8°C - 10°C throughout the year.

In conjunction with the WISY Coarse/Fine Floating Suction Filter connected to the submersible pump, the WISY Smoothing Inlet and WISY Multisiphon ensure only the best water quality is introduced to the rainwater harvesting network.

WISY Smoothing Inlet


The WISY Smoothing Inlet is manufactured in stainless-steel and is installed on the tank base at the end of the vertical inlet pipe from the rainwater filter. Preventing the resuspension of fine sediment on the base of the tank as water enters the storage chamber during precipitation, the WISY Smoothing Inlet functions as a calming inlet and distributes fresh, oxygen-enriched rainwater within the rainwater harvesting tank.

WISY Multisiphon


The WISY Multisiphon is a multi-functional overflow-device which is located within the rainwater tank and connected to the rainwater tank outlet. Due to the skimming-effect fine floating debris on the water surface is effectively removed when the tank reaches the maximum filling level of the rainwater tank. The continuous water barrier within the overflow-device seals against potential odours from the connected stormwater-drain or mixed municipal wastepipe. The WISY Multisiphon is also available with drain-backflow prevention and vermin-protection.

Top seller
WISY Smoothing Inlet DN100/4" WISY Smoothing Inlet | DN 100
€82.90 *
excl. VAT: €67.40 VAT: €15.50 *
WISY Smoothing Inlet DN200/8" WISY Smoothing Inlet | DN 200
€502.82 *
excl. VAT: €408.80 VAT: €94.02 *
WISY Multisiphon WISY Multisiphon | Full Version
€207.26 *
excl. VAT: €168.50 VAT: €38.76 *
WISY Multisiphon WISY Multisiphon | Vermin-Protection
€153.75 *
excl. VAT: €125.00 VAT: €28.75 *
WISY Multisiphon WISY Multisiphon | Drain-Backflow-Prevention
€180.56 *
excl. VAT: €146.80 VAT: €33.76 *
WISY Multisiphon WISY Multisiphon | Basic Version
€127.06 *
excl. VAT: €103.30 VAT: €23.76 *
WISY Overflow Siphon DN 200 WISY Overflow Siphon DN 200
€677.12 *
excl. VAT: €550.50 VAT: €126.62 *
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WISY Smoothing Inlet DN100/4"
WISY Smoothing Inlet | DN 100
The WISY Smoothing Inlet for 100mm/4" pipe is a stainless-steel calming inlet for rainwater harvesting tanks to prevent disturbance of fine sediment during rainwater influx.
€82.90 *
excl. VAT: €67.40 VAT: €15.50 *
WISY Smoothing Inlet DN200/8"
WISY Smoothing Inlet | DN 200
The WISY Smoothing Inlet for 200mm/8" pipe is a stainless-steel calming inlet for rainwater harvesting tanks to prevent disturbance of fine sediment during rainwater influx.
€502.82 *
excl. VAT: €408.80 VAT: €94.02 *
WISY Multisiphon
WISY Multisiphon | Full Version
The WISY Multisiphon with drain-backlow prevention + vermin-protection! Rainwater tank overflow trap with skimming-effect to remove fine floating debris such as pollen from the water surface. Equipped with drain-backlow prevention and...
€207.26 *
excl. VAT: €168.50 VAT: €38.76 *
WISY Multisiphon
WISY Multisiphon | Vermin-Protection
The WISY Multisiphon with vermin-protection! Rainwater tank overflow trap with skimming-effect to remove fine floating debris such as pollen from the water surface. Equipped with vermin-protection rodent-access to the rainwater tank via...
€153.75 *
excl. VAT: €125.00 VAT: €28.75 *
WISY Multisiphon
WISY Multisiphon | Drain-Backflow-Prevention
The WISY Multisiphon with drain-backlow prevention! Rainwater tank overflow trap with skimming-effect to remove fine floating debris such as pollen from the water surface. Equipped with drain-backlow prevention a potential backlog from...
€180.56 *
excl. VAT: €146.80 VAT: €33.76 *
WISY Multisiphon
WISY Multisiphon | Basic Version
The WISY Multisiphon is a rainwater tank overflow trap with skimming-effect to remove fine floating debris such as pollen from the water surface.
€127.06 *
excl. VAT: €103.30 VAT: €23.76 *
WISY Overflow Siphon DN 200
WISY Overflow Siphon DN 200
The WISY Overflow Siphon is a rainwater tank overflow trap for 8" pipe connection with skimming-effect to remove fine floating debris such as pollen from the water surface. Equipped with vermin-protection rodent-access to the rainwater...
€677.12 *
excl. VAT: €550.50 VAT: €126.62 *
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