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US4714547A Aquarium tubules 失效
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Aquarium tubules
摘要:
An aquarium water treatment module comprising a tubule formed of biologically acceptable thermoplastic material. The tubule has a specific gravity proximate that of water. The tubule can be inserted within a filter device such as an internal aquarium filter or a filter cartridge. The tubule is light in weight so that it can disperse within the filter. The tubule supports the propagation of organisms useful in the biological filtration of the water.
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