Product DescriptionRenew™ is ideal for use in systems where phosphate released from all activated carbons poses a problem. Renew™ is also less aggressive than carbon, making it well suited for reefs and planted aquaria. It is also beneficial for use in soft water aquaria where the pH-raising property of many carbons is not an asset. Renew™ will remove organics and particulates in the sub-micron range; it will also help control ammonia, nitrates, and phosphates.Sizes: 100 mL 250 mL, 500 mL, 1 L, 2 L, 4 L, 20 L, 100 LSpecificationsShape: GranularSize: 1-1.5 g/ccDensity: 0.38-0.42 g/ccPore Volume (PV): 0.50-0.60 mL/ccTotal Surface Area (TSA): 500-600 m2/ccTSA/PV: 830-1200 m2/mLMolasses #: 600-700pH in distilled water: <7.2Leachable Phosphate: 0 g/ccDirectionsRenew™ should be used in exactly the same manner as activated carbon. Use 250 mL for each 120–160 L (30–40 gallons*). Use in a filter bag only. Although Renew™ is clean, it is advisable to rinse before use. It lasts about the same as carbon (4–6 weeks).