This is a smart video on how to make your own pond filter with the help of a square bucket and some other materials. If you want to save some dollars on filter, this is the way to do it. It's pretty simple too. Check it out!
DIY Pond Filter. Build a pond or aquarium fillter from a bucket and and a bunch of plumbing parts. The total price was less then $40. (not including the power head pump. I got that from ebay.) Took about 1 and a half hours to build. Not including the 2 hours spent looking for parts at the home building plumbing department.