WISY-Filters save
Water, Energy and CO₂

Using rainwater not only saves tap water, but also energy for its transport and treatment. And thus also emissions of the greenhouse gas CO₂. Around 500,000 WISY rainwater filters are in use worldwide.

Drinking water savings: 42,000,000 m³.

Together, WISY's 500,000 installed rainwater filters collect 42 million cubic meters of rainwater every year. It is used for flushing the toilet, watering plants or in industry and replaces precious drinking water.

Energy savings: 19,000,000 kWh

Processing and transporting 42 million cubic meters of drinking water would have consumed 25 million kilowatt hours of energy. 75% of this, or 19 million kilowatt hours, is saved by using rainwater.

Treatment and transport of drinking water are costly. About 0.6 kWh of electrical energy is required per cubic meter. The provision of rainwater from the cistern requires only 0.15 kWh to the points of consumption.
Comparison of the energy required to supply 1,000 l of drinking water from the tap to rainwater [kWh/m³].

Carbon dioxide savings: 10,000 tons

The production of 19 million KWh of electricity would in turn have caused 10,000 tons of carbon dioxide (CO₂) emissions in the German electricity mix. In other regions of the world, even more. Rainwater harvesting saves valuable resources AND helps limit global warming!

Rainbow behind clouds in sky