206, SIDCO Industrial Estate, Thirumudivakkam, Chennai, Tamil Nadu - 600044, India
Mobile : +91-9500000581, +91-9962200700
Phone : +91-44-65552881
We are offering Pressure Sand Filter that consists of a pressure vessel, which could be either vertical or horizontal-fitted with a set of frontal pipe work and valves, graded silica quartz sand supported by layers of graded under bed consisting of pebbles and gravels, a top distributor to distribute the incoming water uniformly throughout the cross section of the filter and an under drain system to collect filtered water.
Raw water flows down wards through the filter bed and as the suspended matter, which has usually been treated by addition of a coagulant like alum is retained on the sand surface and between the sand grains immediately below the surface. There is steady rise in the loss of head as the filter process continues and the flow reduces once the pressure drop across the filter becomes excessive.
The cleaning of the Pressure Sand Filter is effected by flow reversal. To assist in cleaning the bed, the backwash operation is often preceded by air agitation through the under drain system. The process of air scouring agitates the sand with a scrubbing action, which loosens the intercepted particles. After which, the filter is ready to be put back into service.