Tap water is connected in the direction of the water inlet of the preprocessor, and the water purification port is connected in the direction of the faucet. The flushing port is separately connected to a braided tube and equipped with a right-angle ball valve, which can be opened when flushing. Note: The ball valve in the water inlet direction is open during normal operation, and the ball valve in the backwashing direction must be closed during normal operation. Only when backwashing, the ball valve in backwashing direction will open. FYI