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Backwater - what is it?

All the outlet pipes from drainage fixtures in buildings (washing machines, showers, toilets, etc.) are connected to the sewer, forming a linked pipe system. If the wastewater cannot flow freely through the sewer e.g. after heavy rainfall or due to blockages in the sewer pipes, it ispushed back into the connected outlet pipes and can flood all the areas of the house which are below the backwater level, including any fixtures and furnishings etc.


During heavy rain, the water level rises above the so-called backwater level. This term is usually used to mean street level. Rooms in the basement or cellar quickly become flooded.

Damage caused by ruined flooring, furniture or electric appliances, soaked household goods results in a great deal of hassle and costs for those living in the house.


Draining systems such as floor drains, washing machines, sinks, showers (grey water) or toilets (black water), which are below the backwater level have to be protected effectively and permanently against backwater. Wastewater that flows through gravity fed pipes into the sewage system have to be protected by a backwater valve.

If the public sewage pipe is higher than the drainage spot, the wastewater must be pumped upwards via a fully automatic lifting station.

Program Overview

The wide range of KESSEL backwater valves complies with all legal requirements for different installation situations:


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