WQ series submersible sewage pump Performance Data Application Qaulity Control We treat each pump serious.That`s why our pumps are all guaranted high quality. We have our own casting factory,so that we control the qaulity from raw material.We take sample to do chemical test before casting and do another test during casting to confirm the right percentage of all components.And casting,we would do physical test and spectrum analysis when and after assembling pumps.We do impeller dynamic and static balance,bearing test,roto test to test noise,vibration,shaft.Also we have paiting hourse to paint pumps. Packaging & Shipping FAQ Why choose us? The most full detailed test procedure,the most advanced casting workshop,all the procedures are produced and controlled by ourselves.Thismakes sure the quality is better than normal. Fast delivery,cheaper price and high quality.This would be great helpful to our distributors agents to get more market and serve their users client better. More choices