LQ, BA3 series of clean water pump belongs to the vortex pump that directly coupled between electric machine and pump body. They possess the advantages of more simple construction, smaller measurement, lighter weight, higher head, but with less flow quantity. They are suitable for pumping clean water. It is particularly suitable for domestic applications such as supplying water from well, pool, etc. It is also suitable for water pressure boosting, gardening and automatic water supplying if combined with other appliances.