WCW24

The Multi-Stage Slow Sand Filter combines the simplicity of a slow sand filter with the pre-treatment processes that allow its use on relatively high colour and organic laden waters. The pre-treatment includes roughing filtration and when required pre-ozonation. This presentation will focus on the key design aspects and the operational requirements of the system with reference to two case studies, one in Saskatchewan operating since 2009 with pre-ozone, and one in Ontario commissioned in 2023 also with pre-ozone.