A 20 sq ft sheet of filter floss from Underwater Treasures' Seapora line, measuring 24 x 120 in. This dense mechanical media catches fine and coarse particles before they reach your biological media, which keeps the bio media from clogging and helps polish the water.
Cut it to fit canister, hang-on-back, trickle, wet/dry, pond and other mechanical filters, or to line media baskets and sump chambers. It works in freshwater and marine systems. A large sheet lets you cut a fresh piece whenever the old floss is packed with debris.

