Some of it never even got down the drain, so I'm pretty certain it was less than half a gallon. I'm flushing the garage drain, and every drain in my house right now. Hitting 'em with soap too.
Looks like things are fine. I may have over reacted a bit with this post, but I wanted to err on the side of caution. Thanks for the advice. Cool website. I've got to remember this one.