Easy to use and install - The ATO system easily attaches to your aquarium sump for a simple setup and reliable operation. Clear, durable mounting and versatile holder - Transparent bracket with hand-pulled screws provides a sturdy, durable mount. - The multi-purpose holder can also be used for water and land for tank spray system fixation. Wide application with automatic operation - The aquarium water filler helps replenish water in aquariums to maintain a healthy living environment for fish. - The water changer features fully automatic start and stop operation and requires no electricity. Material quality - Made of acrylic and plastic for a lightweight, durable build. Use scenarios - Daily evaporation compensation: In freshwater or marine setups, the system automatically tops off water to maintain consistent levels and parameters, reducing manual maintenance. - Absence protection: When you are away, the fully automatic top-off helps prevent salinity or salinity-related issues and minimizes stress to fish. - Sump and quarantine tank maintenance: Ideal for distributing water refills in sumps or quarantine tanks, ensuring a stable water level for pumps and filtration. Notes - Designed to attach to standard aquarium sumps. - Built with acrylic and plastic for durability and clear visibility.