Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
Not sure what you folks are talking about.
Do you mean filter floss - which is called polyester quilt batting at a fabric, or crafts, store?
If so, it's definitely one the best water polishers/clarifiers you can use, combined with using Purigen, and fine mesh pre-filters on the filter intake tubes.
Just make sure you get floss without any additives, or fire retardents, and replace them with new floss about every 2 weeks. Very inexpensive - you can't beat it.