Kindly Note: Our atomizer will have a lot of bubbles popping up when they start to work, and will be normal for a few hours. Made of high quality aluminum alloy. With nickel plated for surface, not rust. High-density diffuser disc, produce delicate bubble less than 0.1mm in diameter, not easy to block. Diffuser cup can be easily opened to clean and replace diffuser disc. Simple install with suction cup. Mounted below or directly to aquarium. Mounts inline with canister filters with an crown diameter of 24mm/0.94 inch. Awesome quality, good durability and functionality, solid aluminum construction with o-ring seals, easy cleaning and maintenance when needed. Replaces the need for large external bulky reactors.