| 摘要 |
a fourth guide hose (29) with one end connected to a water supply hose (2) and the other end connected to a main filter (8); a washing valve (30) for controlling water supply to the main filter (8); an auxiliary grill (31) for blocking impurity of water supplied to the main filter (8); and opening and closing means for opening an upper connecting pipe (17a) when the water is supplied to the main filter (8) through the second connecting hose (7) and closing the upper connecting pipe (17a) when the water is supplied to the main filter through the fourth connecting hose (29).
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