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The ultimate goal in the design of a deep filter bed used in water treatment is to produce good quality of filtered water. The design parameters are not seen generally linked to the economic aspects of the filter beds. With the advent of dual media filters which produces about twice the quality of water than produced from conventional monomedia beds with equivalent water quality. the initial cost of the dual media filters are on the higher side when compared to the monomedia filters.A lower backwash rate and slower head loss development in the dual media filters make them deliver consistent performance even under extreme conditions of loading.Hence in case of a conventional mano media filter plants with insufficiency in meeting the demand, increased output could be obtained by up rating the plants to duel media filter beds.BY doing so , significant reduction in Capex investment is obtained due to the avoidance of construction of extra conventional filters.