The house drainage system must be analyzed. This means that the rainwater and domestic wastewater pipes must be known. An unrecognized T-piece that leads rainwater into the domestic sewage pipe can flow unhindered into the cellar, even if a backflow protection secures the pipe against the sewage system.
In the event of a backflow, Stop Silent® SL13 prevents the backflow, but no water can flow out! It is important that no large quantities of water (rainwater or domestic wastewater) flow into this area, as the reservoir volume is limited. If this area is exhausted, water will escape at the next overflow edge (e.g. floor drain, shower, toilet, etc.).
Drainage pipes that are rarely used should be checked separately during commissioning, as they have a low degree of self-cleaning.