First Flush System

The first flush of water off your roof can contain harmful bacteria, tannic acids, sediment, heavy metals and chemicals. With the First Flush System, the first flush is diverted into a chamber, utilising a ball and seat system whereby as the water rises, the ball floats up and once full, rests on the seat which prevents any further water entering and the flow of clean water continues along to the tank.

After rain activity ceases, a slow release valve will gradually empty the diverter chamber and automatically reset. This can have a hose attached and directed onto garden beds. Diverters are available in 90, 100 or 300mm PVC pipe and the length of the PVC will depend on the amount of water to be diverted.


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