The pump above is a Sun Ray pump from Natural Current.They claim 400 GPM flow which is quite incredible,more than most people would ever need but great for a slide or waterfall.

1000.00 Rebate on energy efficient pumps!
from Los Angeles DWP

Solar Powered Swimming Pool Pumps

The DC motor pump above requires no innverter it can run directly off the solar panel power...two basic models available approx. 1 and 1.5 HP (2 HP special order) the 1 HP requires 3 panels the 1.5 HP requires 6 panels custom sizing available qualifies for 30% federal tax credit on total cost of installation. I will be installing these locally call for quote. Pump curves of 1 and 1.5 HP and specs of 1.5 HP below

Link to Solar Pump website

These pool pump systems are DC solar powered and come with a controller and usually panels too. I saw the pump pictured below at a pool show and they were running pump with just two solar panels and it was a cloudy,overcast day. This particular pump is roughly equivalent to 3/4 HP and can pump about 60 GPM on the average pool on a sunny day.   Higher output pumps that require more panels are available for commercial/large swimming pools.

The controller coverts the DC to three phase to run motor.