The Dymax CO2 GA105 glass diffuser features high-quality transparent materials and a high-quality ceramic disc to provide the best distribution of carbon dioxide. It is durable and compact, making it easy to install. It should be placed at the bottom of the aquarium for optimal results. When the ceramic disc becomes clogged, simply soak it in bleach water for 3 to 5 minutes, then rinse with running water and reuse.