Homemade water filter for the aquarium

I found this interesting video with instructions and plans on how to make our own homemade water filter and it seems to be working quite good as well. Maybe someday I will try to work on something like this. Having perfectly clean water cannot be 100% achieved but at least we can try our best to reach some level of perfection which is allowed. The cleaner the water, the healthier the fishes and plants and the less water change cycle for the aquarist. I hate water changes... :D