... various farmlands, orchards, vegetable farms and nursery garden, it can also use in pump unit for water supply ... be moderate. If the pump doesn’t turn, it is generally because the impeller-ring get rusty, you ... water in the pump, overhaul and oil, keep it in a dry and ventilate shade. In winter, ... too low4,adjusting5,the suction distance is too high5,drop itwater yield not enough1,the bottom valve or ...