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Welcome to INTEWA Wiki!
With the new knowledge portal we present you with insights and knowledge from 25 years of experience on the themes of rainwater management and water reuse. From technical data, practical tips, planning help, explanations of trade specific terminology and fascinating basic to expert knowledge around rainwater technology and water treatment edited for all your information needs. Discover it for yourself.
Water treatment and greywater recycling

The heart of water saving is the treatment of previously used or contaminated water from different sources, e.g. greywater from households, groundwater and rainwater. The treatment of this water succeeds with the help of specialized cleaning technologies. How these function and how water treatment systems are planned, dimensioned and installed, learn here.

Rainwater harvesting

Rainwater is one of the most important sources for non-potable and drinking water production. Non-potable water, e.g. usage for toilet flushing, washing machines or irrigation purposes, can easily be obtained from rainwater with help from a rainwater harvesting system. Which components such systems contain and how a proper planning and dimensioning is achieved, read in this section.

Infiltration and retention

Infiltration and retention are fundamentally important to protect stormwater and sewer systems from overloading. Infiltration systems, especially in residential areas, collect and deliver rainfall water underground. If this is not possible, often temporary storage (retention) in attenuation areas is required. Learn here how the construction of an infiltration or retention system as well as the calculation works.

Pumps, operation and rainwater units

Everything you want to know about devices for water supply and their elements such as pump types, pump dimensioning, controls, drinking water backup and expansion tanks we have collected for you in this section.