Agricultural chemicals, except fungicides, herbicides, insecticides and parasiticides; Bacterial preparations, other than for medical and veterinary use; Biochemical catalysts; Biologically active enzymes and microorganisms that are aimed at sanitising water environments and to treat the activation and optimisation of biological filter systems; Chemicals for use in purification of water; Cultures of microorganisms other than for medical or veterinary use; Cultures of microorganisms, other than for medical and veterinary use; Expanded-clay substrates for hydroponic plant growing; Growing media for plants; Nitrobacteria for use in aquaculture; Plant growth regulating preparations; Water-purifying chemicals