Tetra Second Nature

Help keep your aquarium crystal clear with Tetra s Bio-Bags. These disposable filter cartridges are easy to use and work to keep your fish tank in tip-top condition. The ultra-activated carbon is designed to absorb discoloration contaminants and foul odors while the dense double-sided mesh works to trap debris and fish waste. These Bio-Bags are designed to fit Tetra s Whisper Power Filters 10 10i E J and Microfilter. Best of all the three-stage filter cartridges are easy to assemble!