Chemical products for aquarium water (other than pharmaceuticals), alkalies; aquaculture chemicals; except fungicides, weedkillers, herbicides, insecticides, and parasiticides; buffers (chemicals); calcium carbonate; chemical product for aquarium water; chemicals for use in aquariums (other than pharmaceuticals); chemicals for use in fish tanks (other than pharmaceuticals); chemicals for use in fish farming (other than pharmaceuticals); chemicals for use in the treatment of water; filtering materials (mineral substances); filtering media (mineral substances); mineral substances for use in filtering; raw mineral substances; water-hardening product; water-hardening mineral; water-hardening product for aquariums; calcium supplement for aquariums

Aquarium gravel; agricultural limestone; aquarium sand; coarse gravel; gravel; ground rock; limestone; limestone in granular form; natural stone; pebbles; rock grit