Here's the one I came across:
http://www.ehow.com/how_10034977_mak...r-catcher.html
I asked because I don't like to use chemicals and this is a natural method. Just wanted to know if they work before I spent money to make them. The real money is just buying the stabilizer. The rest you already have on hand and the draw to me is like I've already said, it's a natural method.