Swimming pool water circulation mode: the system is like human blood, constantly flowing, processing and updating, so as to ensure clear water quality. The water circulation of the swimming pool is divided into three modes: ① countercurrent type ② downstream type ③ mixed flow type. Countercurrent type: it is generally said that the water flows backward and upward. The water supply outlet is at the bottom of the pool, so it is the backwater of the pool wall and the water supply of the pool bottom. At present, most overflow pools are counter current type, and water is returned through overflow tank. The disadvantage of this circulation mode is that there are many water supply outlets at the bottom of the pool, and there is a dead water area at the corner of the swimming pool. The sundries in the overflow tank will return to the sand tank, so it is necessary to configure a equalizing tank. Forward flow type: Contrary to counter flow, the tank wall supplies water, and the tank bottom returns water
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