#filtration system
- Aquarium — A tank, reservoir, or container with transparent walls (made of glass or plastic), filled with fresh or salt water, equipped with special filtration, lighting, and oxygenation installations, used for breeding, displaying, and studying fish, plants, and other aquatic organisms; it can also designate a large-scale public institution dedicated to showcasing marine fauna. This structural environment simulates the species' natural biotope under controlled conditions.
- Air filter — A technical device or industrial installation designed to retain impurities, dust, pollen, or other suspended particles in the air, ensuring the purification of the gas stream before it enters a room or an internal combustion engine. In ecology, the term also applies to biological systems for natural atmospheric filtration.