The diffusion plate breaks down the CO2 into tiny streams of bubbles, then the CO2 can easily dissolve in water allowing plants to absorb the CO2 for photosynthesis The steel diffuser stainless steel is strong and durable, hard to break, and non-toxic to your pets and plants Ceramic disc is replaceable, it is easy to remove and replace, and please tighten when you install it p> Suitable for aquariums up to 18mm wall thickness The total length of the is 29cm. The ceramic disc has a diameter of 36mm, the CO2 diffuser is suitable for standard 4*6mm CO2 air tubes (inner diameter 4mm and outer diameter 6mm) It is absolutely imperative for aquatic plants to guarantee a sufficient supply of CO2 within the aquarium, because CO2 provides them with the carbon essential for their survival. The CO2 diffuser delivers CO2 in sufficient quantities for aquariums. Reduction of CO2 losses Fine bubbles, easy cleaning < p>Greatly promote plant photosynthesis High quality stainless steel and advanced ceramic technology CO2 escapes from the diffusion plate in the form of tiny CO2 bubbles which allows CO2 to dissolve easily in water, so that plants can absorb CO2 more quickly and carry out photosynthesis efficiently, thus reducing the waste of CO2 gas. We draw your attention to the fact that the diffusion plate needs to start up for the accumulated CO2 bubbles to exert a certain initial pressure; a larger quantity of CO2 is therefore released into the aquarium at start-up. Wait for this effect to cease, without increasing the quantity of bubbles otherwise, you will then have to reduce the quantity of bubbles. Check the CO2 level in the aquarium using a permanent CO2 testing system. Adjust the amount of CO2 in the aquarium by increasing or decreasing the number of CO2 bubbles. The ceramic diffuser disc is consumable. The lifespan varies depending on the type and growth rate of algae in the aquarium. The maintenance period is generally 7 to 60 days. If there is more algae growing on the ceramic disc, the bubble diffuser will not produce outside CO2 or the bubbles will get bigger, you can soak it in 84 disinfectant for one night (the supermarket sells very cheap ).