The chevron tube in Patent No. 163038 dated 20.01.1986 is modified in this invention by introducing two inclined sheets full length of the chevron tube creating two equal size triangles at two sides and one quadrangle at lower side of the chevron tube thus creating three hopper bottoms in place of only one hopper bottom as in Patent No. 163038. The travel time of floecs to reach hopper bottom is also reduced in this invention compared to that in Patent No. 163038 because of the reduction of the travel distance of flocs in this invention. In the present invention the load of floes settling on the flat plates is reduced to a great extent because of the creation of three compartments in this invention instead of one in Patent No 163038. For the same rate of flow of water, the efficiency of the invention improves with respect to that of chevron tube in Patent No. 163038 and for the same efficiency more rate of flow of water is possible. Non requirement of any moving mechanical part or electrical energy is another advantage of the invention, hence useful for rural areas.
