I have this (http://www.amazon.com/Black-Decker-...1?ie=UTF8&s=home-garden&qid=1273179089&sr=8-1) on the way to help fight my black algae problem. Not sure if anyone has one but I'll be sure to post how well it works (if at all). I'm just to lazy to scrub by hand plus I can use this thing on my tile floors and the bathroom. I will always choose the power tool over manual labor!