Regenerable Phosphate-Adsorption Resin for All Marine Fish & Reef Aquaria. Next-generation regenerable phosphate adsorption resin effective in marine aquaria; will also remove silicates. Far more effective than activated alumina and granular ferric products. Will not negatively impact water quality nor release phosphate or silicate once exhausted; will not break up or disintegrate like ferric medias, and contains no aluminum to dissolve inaquaria and harm inhabitants. Synthetic polymer resin beads provide for durability and excellent flow characteristics; may be employed in fluiduzed-bed, canister, or passive filtration. Regenerable up to five times, dramatically increasing cost effectiveness.