Reef Essential Bio-Active Carbon is originally designed to be used in ultra-pure water sanitisation meant for human consumption.Bio-Active Carbon has a unique pore size to water surface area ratio to promote the growth of beneficial bacteria.The bacteria help to improve the effectiveness of organic removal as well as eliminate toxic ammonia/ammonium & nitrite. Bio-Active Carbon will remove organic waste, toxins, phenols (colour), heavy metals, chlorine & chloramine without leaching phosphate or releasing the molecules it has adsorbed.Dosing: Lightly stocked = 15g/month per 100L Moderately stocked = 25g/month per 100L Heavily stocked = 50g/month per 100L Copper removal = 250g/month per 100L Directions:Rinse in RODI water, replace every month. Place in high water flow area or reactor on the slowest setting.Caution: Keep out of reach of children. In case of contact with eyes or skin flush immediately with running water for 5-15 min, if irritation persists seek medical advice. If swallowed seek medical advice immediately.