1 liter of CDX will last about 6 weeks (or longer) with a flow rate of about 100 LPM of home recycled air.
NOTE: CDX reacts to carbon dioxide in the air. Keep the container sealed and do NOT wet the CDX with water.
Two Little Fishies CDX Carbon Dioxide Adsorption Media helps maintain and elevate aquarium pH by removing CO2 (carbon dioxide) introduced through a protein skimmer. Excess CO2 is a problem because it dissolves into aquarium water amd depresses the average pH. Simply pour the CDX into a tall columnar reactor such as the Two Little Fishies PhosBan Reactor and connect the CDX-filled reactor to your protein skimmer's air intake hose. You can use the Two Little Fishies CDX Adaptor or a similar barbed, reducing fitting to connect the air intake for the protein skimmer to the outflow pipe of the reactor.