Multi grade filter is a depth filter that makes use of coarse and fine media mixed together in a fixed proportion. This arrangement produces a filter bed with adequate pore dimensions for retaining both large and small suspended particles. This filter performs at a substantially higher specific flow rate than conventional filters.
Raw water passed through the Multi Grade Filter, it consists of multilayer of filter media consisting graded sand, white sand, fine sand, activated carbon and pebbles layers, which retain the suspended particles and activated carbon adsorbs onto its surface free chlorine, organic compounds, colour and odour. During the filtration cycle the filter bed retains the dirt and suspended particles from the water and accumulates within the filter bed. As the filtration progress the filter media gets loaded with the retained particles, this results in a continuous increase of pressure drop across the filter, when a predetermined pressure drop level is achieved the filter is shut down for cleaning.
The filter media is cleaned by backwash system. After back-washing the filter is rinsed with raw water and after the required quality of water is achieved the filter is put back into service. Depending on the filtered water quality required back-washing is either done with raw water or filtered water.
Multi grade Filter is comprises of Mild Steel /SS / FRP Pressure Vessel, Frontal piping wok with manual / Automatic multi port valve butterfly valve / conventional valves for easy operation and control. Available 1,000 Liters/hr. to 10,00,000 Liters/day.