I found an amazing filter bag at Walmart today:
http://www.soap.com/p/tide-high-per...250292&utm_content=pla&adtype=pla&cagpspn=pla
It's super fine, not even the fine powder in my carbon got out, so it's not going to let any pieces through. I put all of my carbon in it, rolled it up into a nice log, then shoved it into my waterfall pit. I love it, and it seems to be made out of some artificial fabric so it should last for years. $3 each, they're quite huge, probably no one will need this much space, but it's easy to roll up to the exact size you need. I'm very happy with these things.
http://www.soap.com/p/tide-high-per...250292&utm_content=pla&adtype=pla&cagpspn=pla
It's super fine, not even the fine powder in my carbon got out, so it's not going to let any pieces through. I put all of my carbon in it, rolled it up into a nice log, then shoved it into my waterfall pit. I love it, and it seems to be made out of some artificial fabric so it should last for years. $3 each, they're quite huge, probably no one will need this much space, but it's easy to roll up to the exact size you need. I'm very happy with these things.