Replacement roll RM 250 32mReplacement fleece rolls for the NanoMat Fleece Roller Filter. Although specific lifespan will vary according to system parameters such as volume, bio load, feeding schedule, and initial water quality; each 105' roll of filter fleece should last roughly 4 weeks on a moderately stocked reef system. Bare bottom tanks will typically exhaust rolls at a faster rate. Additionally, usage rate may be significantly higher for the first few weeks after