Dymax CO2 Glass Atomizer GA102 is made of highly crystal clear material and high quality ceramic disc to provide optimum diffusion of CO2. It is durable and compact in size and thus easy to install. It should be place at the bottom of the tank in order to obtain its optimum result. When the ceramic disc is blocked, simply soak it into bleach water for 3 to 5 minutes then rinse with tap water and re-use again