I built my GH in 2007. When I initially installed the watering system, I had two components: sprinklers and misters. The sprinklers were run by a pump that was on a timer, running every day for 7 minutes. The misters were on a repeat cycle timer, running for 30 seconds every 45 minutes (though I'd tweak it as needed). I finally broke down and installed a control unit with different zones yesterday. The sprinklers are on their own zone, and the new foggers are on another. The pressure switch on the pump turns it on and off now instead of a timer. Also, the foggers are on a humidistat, so instead of being time-based, they'll only be used as needed. The misters have been removed. This might not sound like a lot for some of you, but for me it's huge! I've been needing to do this since I first set up the GH. I can control my watering from my kitchen now! WOOHOO!