Translations:Regenwassernutzung/163/en

Protection from backwater and small animals

Non-return valve and small animal protection

Clean water does not mean only to clean flowing rainwater, but also to assure that no pollution or small animals from the drainage system can enter the storage through the overflow. This is easily ensured by a non-return valve. Some filters, such as the PURAIN 100 already include these. In some countries such as Germany, the non-return valve is a requirement of the standard (DIN 1989 Part 1 prescribed non-return valve for connection of overflow to a separate system).