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Welcome to INTEWA Wiki The free source for information about rainwater harvesting and rainwater infiltration, as well as for water treatment and grey water harvesting.

The necessities as well the options to save substantial amounts of potable water have intensively developed in recent years. In addition to obvious measures such as using minimal accessories and less water, it goes without saying that treatment of previously used or contaminated water are also essential.

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According to the European Drinking Water Act[1], water in household, which is not used for drinking and personal hygiene can be replaced by process water. In Europe, this is mostly done for toilet flushing, washing clothes or watering the garden. Even an household with frugal budget can thus save up to 50 l / person per day of potable water. This accounts for about 50% of total consumption.


In storm water management, the findings asserts that rainwater should be infiltrated at the place of access instead of discharged through sewer systems. If this is not possible, then in several cases, the temporary storage (retention or buffering) of rainwater is required in storage volumes in order to protect the drainage systems from overloading and to limit their dimension.


Process water centres also known as operating and monitoring stations, domestic water plants, process water plants, rainwater plants or rainwater centres are ready to connect devices for supplying process water with integrated pump, controller and potable water top up.