Regenerable Nitrate-Adsorption Resin for all Marine Fish, Reef & Freshwater Aquaria Overview Next-generation regenerable nitrate adsorption resin effective in marine and freshwater aquaria; does not require soaking in buffered water prior to initial use. Highly-selective for nitrate. Will not negatively impact water quality, nor release nitrate once exhausted. Synthetic polymer resin beads provide for durability and excellent flow characteristics; may be employed in fluidized-bed, canister, or passive filtration. Regenerable over 250 times, dramatically increasing cost effectiveness. Will not impact alkalinity in aquaria as some competing products may.