Pump for Abrasive liquids

Low cost Cast Iron pumps (1 or 1.5) with Nitrile (Buna-N) rubber parts are used for this application.

Diaphragm Hand Pump does this job easily, as it simply sucks and pushes out abrasive liquid without churning/clogging. 

There are duties, such as cleaning of grinding machine coolant tank, tank of machines such as CNC lathes, where liquid is full of emery, metal turnings and abrasives.