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How Pressure Sand Filter Works

Pressure sand filter consists of a pressure vessel-this 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 is excessive.The pressure sand filter is now taken out of service and cleaning of the 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.The filter is now ready to be put back into service.Picture low flow psf (frp vessel) and high flow custom vessel (ms vessel) advantages and features 1.Efficient turbidity and tss removal 2.Filter up to 20 – 30 microns 3.Frp, cs, msep, ss vessel available 4.Asme pressure vessel is also available 5.Standard and effective silica quartz sand media 6.Low pressure drop across the vessel air scouring available for high flow pressure sand filter vessel pipes from the pool are blocked off or restricted.Also the isolating ball valves could be partially turned off or blocked with debris, or even a blocked filter basket in the pump to a blocked pump chamber or impellor inside the pump, or finally a restricted inlet to the multiport fitted to the filter.Further investigation will be needed to find the reasons.If the plantroom is below water level, make sure you can isolate the pool totally including any returns and that the ball valves are installed in the correct direction.If the pump appears to be the problem and you need help with your investigations, please use the contact page to book an appointment for a psp engineer to visit.To obtain more information on the psp pool owners club, please visit the members page.The information on this page will be added to the appropriate section for members future searches.Water is pushed through a bed of filter sand and removed through a set of lateral tubes at the bottom.

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