This European Standard specifies the principles of design@ sizing@ installation@ identification@ commissioning and maintenance of greywater systems with the purpose of use of greywater on-site. It applies preferably for the use of treated greywater for: ?? WC flushing; ?? garden watering; ?? laundry; ?? cleaning purposes. This European Standard also specifies the minimum requirements for greywater systems. Excluded from the scope of this European Standard are: ?? the use as drinking water and for food preparation; ?? the use for personal hygiene purposes; ?? direct reuse systems for external use e. g. garden watering; ?? product design for specific system components; ?? industrial effluents; ?? heat recovery and cooling demands. NOTE Conformity with this European Standard does not exempt from compliance with the obligations arising from local or national regulations.