With the Wavin sand traps, all the dirt is collected at specific points which facilitates the maintenance of the system. It also prevents that the rest of the storm water systems gets contaminated.
Sand traps are available in combination with the collection function like the Wavin save gully. There are also traps available to filter the sands and silts that may come from the roof.
Wavin has developed special silt traps that can filter bigger volumes of water and also have the possibility to allow bypassing when the flow gets to high. These are useful when it is not possible to filter the water in the very beginning of the run-off and when the second flush can be considered as clean.