How to filter, store and extract rainwater correctly
The following film shows a typical house with a rainwater harvesting system. Follow the water drop on its way from the gutter through the four purification stages to the cistern and to the consumers.
Construction of a rainwater harvesting system
WISY's principle of 4-stage purification makes rainwater storable. This increases independence from the water supplier and clear water is also available in dry periods:
Level 1
In the pre-filter, such as the vortex fine filter, all particles larger than 0.28 mm are separated. The filtered rainwater is enriched with oxygen so that unwanted, anaerobic bacteria do not stand a chance. 90% of the water is stored clean in the cistern, while the vertical stainless steel mesh always cleans itself with the residual water.
Level 2
The inlet calming system carefully distributes the fresh water in the cistern without stirring up sediments. Stored water remains clear.
Level 3
The top layer of water regularly rinses into the overflow of the multisiphon. In this way, no barrier layer can form on the water surface and the oxygen exchange between air and water remains optimal. The backflow protection, the small animal protection and the odour trap additionally protect the overflow of the cistern.
Level 4
The clear rainwater is extracted from the cleanest part of the cistern, about 20 cm below the water surface. It is sucked in via the floating suction filter. A pump transports it directly or via an intermediate tank to the consumers where it is used.
