A professional rainwater system firstly has to provide good water quality with a high operation reliability. Secondly, the system has to be low maintenance and easy to install. These high demands can only be realized when during the development, production and installation these factors are taken into account as well as the properties and characteristics of the various components. If the before mentioned demands are met, only then can a system receive the GEP "IRM" label. IRM stands for Intelligent Rainwater Management. IRM and standards Rainwater systems must meet strict technical requirements that prevents drinking water from coming in contact with rainwater. The requirements are stated in technical regulations and publications such as the EN 1717. Systems certified by Belgaqua and KIWA meet these technical standards, keep this in mind when buying a rainwater system. You can review these certifications on the product pages.