So I was at my Lfs, Coral Connection in Sarasota today and noticed one of these on their workbench. Strange looking contraption at first site... I had to know what it was so I asked one of the owners James what is this thing?? He replied "the Reef Blaster" the other partner Ray makes them himself and actually sells them. He said they work great to clean your rock, water changes, and excellent sump cleaners. It's a battery operated little hand held bilge pump lookin thing that you submerge in tank and it blows a perfect stream to clean live rock and hard to reach places. It's so cool, I had to have one so I purchased. I love supporting my lfs and this is an awesome little invention. Mine is on the charger now, takes 4 hours for the first charge... cannot take it off until the green light flashes or the battery memory will only charge to that point forever. Ugh... long wait, can't wait to blast my rocks and effortlessly clean my whole sump out tonight. Oh and I will also use for water change for it is that time again. I will report back after I blast my tanks to lyk how it really works. Can't wait to try it out!!