The float switch has a power adapter that plugs into my power strip, then the pump gets plugged into the float switch's power adapter, when the water in the tank reaches the level I want, it closes the relay and sends power to the pump until the water level lowers beneath the threshold again. I can easily move the float up and down the PVC pipe to adjust the water level.
It's not rock solid yet but I wanted to make sure everything worked first. It has been running for about 3 hours now with no sign of any problems, at least not to do with the pump. I still have to fine tune the rate each bed gets flooded by using the ball valve but they do all flood completely within the 15 minute pump cycle. I will focus for the next few days on cleaning the filters of the pumps out a couple of times to see if I can clear up the water some, I like being able to see the bottom of the fish tank. I am not sure if I should be filtering out the solid waste or simply letting it get pumped into the grow beds but I will hit up the Aquaponics forum over at http://aquaponicscommunity.com/forum
to see what the consensus says. That forum is a plethora of good info and if you are going to try aquaponics I would highly recommend it. It is well moderated and I have always gotten responses. Ok, so some pics, some will be self explanatory.