Idea for DIY filter cartridge
HOw does this idea sound for a DIY filter cartridge?
Step one cut egg crate to appropriate size
Step two, rubber band filter floss around egg crate
Step three, when the cartridge get's clogged alternate changing half of the floss, the bacteria will continue to live in the other half and on the egg crate
You could even cut up the extra egg crate and put it in the bottom of the power filter to use like bio balls
The only downside I can think of is how to insert carbon if it's needed.