Maracyn-Oxy

[cosmodude12]

Has anyone tried this product? Would it harm the biological filter?

http://www.topcollarpet.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/3/3/33789_pid.jpg

[Eddie]

Couldn't tell you, it appears to consist of Chlorine Oxides.