Chemical products for aquarium keeping, namely, water treatment chemicals for use in aquariums, [ unprocessed raw plastics for filtering aquarium water; ] preparations for softening water; [ manures and ] fertilizers; absorbing carbons for use in aquariums; mineral substances in the nature of filtering materials for use in aquariums; biologically active enzymes and microorganisms that are aimed at sanitizing water environments and to treat the activation and optimization of biological f...