This cost effective and durable media removes more particles than other media, effectively trapping debris and small particles into the filter, leaving your water crystal clear. Acurel Polyester Filter Fiber creates fewer gaps for better performance, will not degrade, is easily replaceable, and will complement the performance of any filter. Use in fresh and saltwater aquariums. Loose fiber batting has fewer gaps because it creates a tighter fit.|Fewer gaps = better performance.|100% polyester will not degrade

GRP:PET