Do your self a favor and get one of these. http://www.coralvue.com/4inch-waste-collector-with-auto-shutoff
I use the old-school kind of auto-shutoff waste collector. The problem is that if it really gets going, it still leaks a little. That looks like a good gizmo but not for $169. Plus I sometimes make a couple gallons of skimmate, that thing's tiny!