Pond Fountain Sump Pump . I suggested she try the 59.95 pond and fountain pump from harbour freight and it has been perking along for 2 years now. Pond pumps, fountain pumps, waterfall pumps and hydroponics pumps have to be made for continuous duty (as opposed to a sump pump, for example, which only runs intermittently). 1/2HP Submersible Sump Pump Clear Water Sub Pumps Empty Pool Pond Pool from econosuperstore.com 8w submersible water pump aquarium fish tank sump pumps pond feature 600 l/h. Submersible water pump aquarium fish tank sump pond feature waterfall pump. £12.50 + £15.15 p&p + £15.15 p&p + £15.15 p&p.