Diamond Blend Premium Activated Carbon and Ammonia-Neutralizing Crystals is ideal for new aquariums. This special formulation of new faster-acting Black Diamond and super-effective White Diamond cleans and conditions aquarium water, ridding it of dissolved organic waste and odors as it removes toxic ammonia and chloramines. Outperforms other blends by as much as 4 to 1. Can be used in any application including power filters and canister filters. For freshwater aquariums only.