Renewª is ideal for use in systems where phosphate released from all activated carbons poses a problem. Renewª 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. Renewª will remove organics and particulates in the sub-micron range; it will also help control ammonia, nitrates, and phosphates. This product is sold by volume. Cited weight is minimal weight. Renewª should be used in exactly the same manner as activated carbon. Use 500 mL for each 240-320 L (60-80 gallons*). Use in a filter bag only. Although Renewª is clean, it is advisable to rinse before use. It lasts about the same as carbon (4-6 weeks).