The easiest way to accelerate plant growth. Carbon dioxide is one of the essential ingredients in green plant growth. This CO2 Generator provides the carbon dioxide to meet maximum growing potential, and operates for only pennies a day. CO2 generators feature powder-coated steel enclosures that resist moisture, rust and discoloration - providing years of trouble-free operation. Buil in two-stage safety pilot valve does not allow fuel to flow to the burner unless the pilot is lit, and will shut down the fuel supply in the event the unit falls or tips over. The solid state electronic ignition module creates a spark to light the burners. CO2 generators are available in both propane and natural gas models.