<；P>；PROBLEM TO BE SOLVED: To make the pump arrangement part of a water filter having a water filtration part and the pump arrangement part connected to it useful not only for arrangement of lifting pump, but also for further improvement in water qualities in a water tank. <；P>；SOLUTION: The water filter A has the water filtration part 1 and the pump arrangement part 2 connected to it and the water filtration part and the pump arrangement part are installed on the upper part of the water tank B and used. The water filter is equipped with an auxiliary case 3 to be mounted on the pump arrangement part 2, the auxiliary case 3 stores a water quality control material F1 and has a pump connection part 31 to be connected to the water delivery part P1 of the lifting pump P, a water supply pipe 32 standing from the pump connection part, a water flow divider 35 that is connected to the upper end part of the water supply pipe 32, dividedly drops a part of water lifted by the pump P toward the filter medium F of the water filtration part 1 and the rest toward the auxiliary case 3 and an overflowing outlet part 33 for making water in the auxiliary case 3 flow into the water filtration part 1. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
