Feature: 1. Adopting circulating absorb fish feces and filtration, the product itself has no power, no electricity, and is safe to use. 2. Connected to oxygen pump, oxygen pneumatic allows fan to rotate to drive water flow to generate suction, sucking in fish poop and other dirt. 3. Quartz biological beads have dense pores and a large attachment area to prevent corrosion by other acid substances. 4. Install air bubbles inside, connect the trachea and the aeration pump, which can produce the effect of aeration. 5. Pneumatic filter, oxygen pump flushes gas into the middle, and the gas coming out of middle will drive water inside to flow out and filter water quality. Specification: Item Type: Fish Tank Filter Material: Plastic Weight: Approx. 355g / 12.5oz Product Size: Approx. 15x9cm / 5.9x3.5in Uses: Suitable for fish tanks, aquariums, aquaculture. Package List: 1 x Fish Tank Filter Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Quartz biological beads have the functions of filtering, purifying water, and adsorbing peculiar smells. Dust on the surface is a normal phenomena.