This brilliant little submersible pump has a flow rate of 800 litres per hour at zero head, and can lift water up to 5 metres. Two pumps connected in series can lift water up to 10 metres.
 
Half inch BSP connections
Almost silent operation
Brushless for longer maintenance-free life
Rated for continuous use
Ideal for lifting water from a farm pond to a header tank
Can be connected directly to a 20 watt solar panel (use a 40 watt solar panel for two pumps)
For lifting water more than 3.5 metres, 2 pumps in series are more efficient than 2 pumps in parallel