CO2 Pro-Tips from the hydroponics experts Green Thumb Hydro:

In order to make the most of your indoor garden you must provide your plants with all of the elements they require to flourish in their natural environment. Maintaining appropriate light, water and nutrient levels is critical. If you're already doing the aforementioned the next step in boosting yield is CO2. The benefits can be monumental for the veteran gardener. 

As always Green Thumb Hydro carries the latest CO2 regulators, testers, generators and more.