Our current sewer designs are due for renewal. We have been designing according to standardized designs for years,  have separated the rainwater from the wastewater, so that no storage is required for peak showers in the wastewater sewer. But in practice we still use street gullies to guarantee the flow, which is in fact no longer necessary. We therefore still apply a technical measure to prevent a sewer from becoming clogged, while this is not necessary if we consider the hydraulic function to be leading. The result of this exercise is a so-called slim sewer, a system that combines cost efficiency, impeccable hydraulic functioning and a great potential for the recovery of raw materials in the long run.

The slim sewer is an extension of the reliable indoor pipe water network that we have been using for years. A closed pipeline network that functions better hydraulically due to the absence of hydraulic dead points (inspection pits, thresholds, etc.). A system that can transport more waste load with less slope and a higher filling level. Key factor is the potential buoyancy created by a higher degree of filling in a tube with a smaller diameter. This results in a faster pressure build-up around the accumulation of solid materials. All this results in a very cost-efficient system, made of light and easy-to-process materials (PVC, PE, PP) that can save up to 40-60% of the current costs.