The diffusion plate decomposes the CO2 into tiny streams of bubbles, then the CO2 can easily dissolve in the water thus allowing the plants to absorb the CO2 for photosynthesis The stainless steel diffuser is strong and durable, not easy to break, and non-toxic to your pets and plants Ceramic disc is replaceable, easy to remove and replace, and please tighten when you install Suitable for aquariums up to 18mm wall thickness The total length of the J-Pipe is 40 cm.The ceramic disc is 36mm in diameter, the CO2 diffuser is suitable for standard 4*6mm CO2 air tubes (inner diameter 4mm and outer diameter 6mm) Product NICREW CO2 Diffuser It is absolutely imperative for aquatic plants to guarantee a sufficient supply of CO2 in the aquarium, because CO2 provides them with the carbon essential to their survival.The CO2 diffuser delivers enough CO2 for aquariums. Reduced CO2 losses Fine bubbles, easy cleaning Greatly promote plant photosynthesis High quality stainless steel and advanced ceramic technology Tips: We draw your attention to the fact that the diffusion plate needs to start up that the accumulated CO2 bubbles exert a certain initial pressure; a greater amount of CO2 is therefore released into the aquarium on start-up. Wait for this effect to cease, without increasing the amount of bubbles otherwise you will have to reduce the amount of bubbles again afterwards. Check the CO2 level in the of the aquarium using a permanent CO2 test system.Adjust the amount of CO2 in the aquarium by increasing or decreasing the number of CO2 bubbles. The diffuser ceramic disc is consumable.The lifespan varies depending on the type and growth rate of algae in the aquarium. The maintenance period usually is 7-60 days.If there is more algae growing on the ceramic disc, the bubble diffuser will not produce outside CO2 or the bubbles get bigger, you can soak it in 84 disinfectant for one night (the supermarket sells very cheap ).