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The initial 2-5mm rain is heavily polluted, and quite small flow. Because of gravity, the rain will first pass through the lower and open discharge pipe in this device. When the rain volume increases, it hits the top heavier, and the floating ball in the sewage pipe is under a certain pressure, to stuck the first flush pipe. Water level in the tank goes up, and the rainwater goes through a horizontal filter and the outlet, to be harvested into the storage tank. After the rain stops, with the reduction of the rainwater stored in the device, the floating ball is automatically reset because of its spring force, and the garbage produced by the filter is brought out, so as to achieve first flush, filtering, automatic discharge of sewage and so on.

Applications:

It can be used as a first flush device in rainwater systems on roofs, under grounds or roads, and generally installed after interception basket device.

Specifications: