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1. The end of the valve can not open. Is usually set aside a long time due to water pump, valve gasket is stuck, no washer valve may be rust.
2. Filter mesh bottom valve is blocked; or potential water valve at the end of the sludge layer caused by the blockage of the strainer.
3. Serious impeller wear. Impeller blades have been worn for a long time, which affects the performance of the pump.
4. Gate valve or check valve malfunction or blockage will cause flow to reduce or even draw no water.
5. Leakage of the export pipeline will affect the water extraction.