My surge devices fill from the sump, each is about 13 gallons so they take a significant ammount of water to fill. I also have an auto topoff, I simply set the float switch at a point in the sump that I never want to go below, basicly the point where the sump should be if both surge tanks are full and just about to dump. This way the water level in the sump can fluctuate up and down with the surge device with no effect on the autotopoff until the water level drops to low.
A surge doesn't have to be noisy at all, mine is basicly silent. All that is heard is a low quiet thump when the flapper valve opens, but no toilet flushing sounds, no loud bubbling sounds and very little bubbles.
Jon
A surge doesn't have to be noisy at all, mine is basicly silent. All that is heard is a low quiet thump when the flapper valve opens, but no toilet flushing sounds, no loud bubbling sounds and very little bubbles.
Jon