I was at my LFS yesterday just browsing their new shipments, on my way out I noticed some power filters I hadnt seen before. Some Living World Dynaflows, that say they flow 300 gph on the box, I opened it up and they were of course very cheap and looked like poor quality plastic, so I decided to take my chances paying for a $10 power filter. When I got home I set it up and threw it on my 20 gallon just to see if this so called 300 gph filter actually was true. Sure enough, it pumps a good amount of water, I was surprised. It pumps way more than my 200 gph filter for sure, I let it run all night on my 10 gallon tank, and it still is working. I might go buy a few more for extras or something, couldnt hurt to have some spares.