Pump surface and pressure chamber (also known as volute) inner surface of the uneven rust. If the surface roughness, it will pump the pump to reduce water 7% -8%. When repairing, just smooth with steel brush and iron sandpaper or grinding wheel, so that the pump can reduce fuel consumption or power consumption by 9% - 14%.
dxm led house light,dmx house light,church house lighting,dmx pendant led,house light dmx
EV LIGHT Guangzhou Co., Ltd , https://www.evstagelights.com