Welcome to BassCat. You will love your boat. I had a 1992 Sabre until last year when I moved up to a 2004 Cougar. With the switch in the “Manual” position, the aerator will pump until you turn it off. When the aerator switch is in the “Auto” position the timer will work. It will turn on for 1 minute and, depending on the setting, it will stay off from 3-5 minutes before turning on again. Im not certain if “Min” is for 3 minutes off and “Max” for 5 minutes off….or if “Max” means for it to run the maximum amount of time which would mean 3 minutes off. Somebody who knows for sure will be able to tell you but thats the basics of how the knobs work. I was off a little bit on the times. haha Last edited by toledobasser on August 31st, 2012, 2:45 am, edited 1 time in total.Jim EbarbMany, LA (Toledo Bend Lake)2004 Cougar/ 225 OptimaxHumminbird Helix 12 Chirp SI on BalzOut Mount at bowLowrance HDS 7 at bowHumminbird Helix 12 Mega SI on Ram Mount at ConsoleLowrance HDS 8 in dash at console