Premium quality activated carbon, offering desirable physical and chemical characteristics for application in all, marine and freshwater aquaria, featuring high capacity for the removal of latent organic material from water and minimal impact on pH, Promotes water quality by removing dissolved organic material, hence encouraging higher oxidation-reduction potential (ORP), Features high capacity for organic removal (high Molasses number), high Iodine number, low ash content, minimal, dust, and immeasurable phosphate (verified with lab-grade water analysis equipment), Average particle size encourages optimal flow and effectiveness; may be employed in canister or passive filtration, Pellet, 500-g, SKU: RYLHC1045