Wash water quality

For many sites, a suitable potable water source is unavailable. Furthermore, potable water is expensive, and because we do not require a hygienic clean, using it to clean CSO screens is a waste of clean water. 

Whilst the washwater does not need to be potable, the Screen Blaster requires water that has been filtered to 1mm or less. A high particulate content will tend to bung up the gears within the Screen Blaster as they are directly exposed to wash water. As such, a clean water supply is required for the wash water in such systems. If rain or stormwater is being used, then this should be adequately filtered. 

For full automated cleaning systems, a storage tank of suitable water will need to be provisioned. This should be of a sufficient size to complete at least 1 full cleaning cycle. The tank can be replenished between storm events and, generally speaking, this can happen over a long period of time. With a correctly designed system, it is possible to replenish water storage tanks with rainwater that has been adequately filtered. As the screens are cleaned after a storm event, there will always be sufficient rainfall to replenish the tank between storm events.