What you need to look for when buying a pump for your rainwater tank. Is the water being used for garden only, or household drinking water, or both?
K2 1/10 HP Compact Non-Submersible Transfer Pump UTT01004K - The Home Depot
BurCam Stainless Steel Shallow Well Jet Pump with 6.6-Gallon Tank — 3/4 HP, 900 GPH, Model# 506547SS
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Shallow Well Pump 1.6HP Pressure Tank 1000GPH Jet Pump for Garden Irri – GoplusUS
Red Lion RL-SWJ50/RL6H 1/2 HP Shallow Well Jet Pump/Tank Package, 12.6 GPM Cast Iron Pump with 5.8 Gallon Pressure Tank, Red/White, 97080503
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