Filter Problems, please help

[Wolfx]

I have a 50/50 set up in a 18x18x24, i just cant keep the filter clean, every 2 days i have to clean it. Anyone have any suggestions? filter types? easiest to clean etc.. I currently use the fliterd water as the water fall effect in tank. Id like to keep it, but not nessasary. http://www.livestream.com/wolfieseyes
To see my current setup.
TY Wolfy~