Sump Pump For Fish Pond . £12.50 + £15.15 p&p + £15.15 p&p + £15.15 p&p. When a pump is labeled a certain gph it indicates the maximum amount it. 1/2HP Submersible Sump Pump Clear Water Sub Pumps Empty Pool Pond Pool from econosuperstore.com 45 sold 45 sold 45 sold. £9.50 + £30.75 p&p + £30.75 p&p + £30.75 p&p. We recommend this pump for mid to large size salt water tanks, fountains and ponds.