Submersible Dewatering Agitator Pumps. Our dewatering agitator pumps have a built in impeller to make sure the liquid is moving before it enters the main pump chamber. The agitator delivers kinetic energy to solids surrounding the pump intake to re-suspend them into a fluid state. A submersible pump without agitation will only pump water, leaving the solids – which over time will block the intake. Call Alton Pumps Services on 01420 561665 to discuss your Agitator Pump requirements.