... so on.The source water should be rinsing at room temperature,the insoluble granule should be less than 0.1%( ... water,lake water,well water etc.The pump should be used around the range of its specified delivery lift ... ,The delivery lift should not be too low,If it is lower than 80 ... of the specified delivery lift. The heat protectorwill be easy to work,It may stop the pump, ...