Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have used cut up nylons for many years. They do not leach color, and they do not disintegrate.
I have heard of problems using them with Purigen, though. Purigen can be rejuvenated with bleach, and the stockings do not hold up well to bleach.
Other materials I have used:
Food mesh bags that I buy onions, avocados, or other things in.
Problem: The softer they are the better they fit into the filter space, but the holes deform, stretch, and the media falls out. This is only a minor annoyance, since only the largest ceramic bio-noodles fit in these bags.
Manufactured media bags: Too stiff to properly fill the space in the filter. Too much water flows around rather than through.