Utilising free rain water allows up to 50 % of the drinking water needs of a family household to be replaced in applications where drinking water is not required. The savings in commercial and public systems can be over 90 %.

A variety of applications such as toilet flushing, washing machines, garden watering and cleaning is possible thanks to the particularly high quality of the rain water. There are additional applications in the industrial and commercial fields.

There are many benefits to using rain water. Saving drinking water lowers water costs and makes a significant contribution to environmental protection. However, there are additional benefits due to the special quality of rain water:

- in toilet flushing: less urine scale formation

- in washing machines: 50 % less washing detergent

- in watering gardens: promotion of plant growth

A modern rain water utilisation system consists of two basic components: The RainwaterManager, a compact central management unit with a pump, control equipment and automatic drinking water backfeed and the rain water storage tank with an integrated filter,

smoothing inlet, floating extraction device and overflow pipe.

 The RainwaterManager is installed inside the building and the rain water storage tank is located either in the ground outside or in the basement. The RainwaterManager controls the system and ensures operational reliability. This is where the water is drawn out of the storage tank and transported to the supply points in the building. At the same time, it monitors the water level in the cistern and automatically switches to drinking water operation as soon as there is too little rain water in the storage tank. In this case, drinking water is back fed within the building depending on requirements, guaranteeing a constant supply of water at all times.