Yagote 3 Spiro cO2 Diffuser is perfect for tanks 15 - 50 gal (60L - 200L) The ceramic refinement piece has atomic pores on its surface, which can produce fine bubbles that rise slowly and ensure efficient diffusion of carbon dioxide in the aquarium With the suction cup design, it is easy to install and operate and can fix on the aquarium firmly And the fine, see-through glass is blended in the environment of aquarium, which can create a sense of harmony and unity NOTE: The product belongs to fragile product We try our best to avoid the breakage Our package used EPE material to prevent the product from breaking If there is breakage when you receive it, please be careful to avoid being scratched And please feel free to contact us at any time, we can send you a new item If the bubble cannot be diffused smoothly, and if 2-3 big bubbles per second can only produced few bubbles, it mean the diffusing disc doesnAt work well Please contact us for the first time, we will send you a new item We guarantee our service, please feel free to purchase We will improve the quality of our product and service continuously Package Included: 1 x cO2 3 Spiral Diffuser 1 x Suction cup If there is breakage when you receive it, please be careful to avoid being scratched Please feel free to contact us if you receive defective products, we can send you a new item or refund your money immediately IMPORTANT Notice: This cO2 diffuser only can be used for carbon dioxide and need to soak for more than 48 hours for the first use for maximizing product performance and prevents from rupturing due to sudden inflation Wet the glass tubing before inserting the silicon or rubber tubing to avoid damaging glassware Please do NOT use brushes or wipe with any cloth to clean the ceramic surface to avoid micropore blocking If ceramic diffuser disc is dirty, please change it or use special cleaner to clean it