CO2 is essential for plant growth. It is the gas humans breathe in. In an enclosed growing area plants will use up the available CO2 and unless replaced with fresh air, growth will eventually stop. Increasing CO2 will not only maintain growth, it will dramatically speed it up. The average level of CO2 in the atmosphere is around 350ppm (parts per million). Commercial growers often run greenhouses with levels of CO2 between 1200-1500ppm. Now the home grower can do the same. Working out injection volumes                        _____________________________________________________________________  BIO GREEN. 4 KW C02 (Growth Gas Generator) The Growth Gas Generator is designed specifically for the production of CO2. It burns readily available CO2 and can easily be controlled by a special timer to ensure CO2 is produced at the right time of the day.  also includes a Thermostat from2c-25c,  Dimensions: 40cm high x 14 cm x 30 cm £210.00   _____________________________________________________________________ C02 release kit. The CO2 Release Kit is one of the best ways of injecting CO2 into an indoor gardening environment. The CO2 release kit features a pressure gauge, which will gauge the amount of CO2 in the tank, a solenoid valve which will turn the unit on or off & a flow meter which determines the amount of CO2 released.  Co2 release Kit £ 145.00              _____________________________________________________________________ compugas: A compact CO2 release and fan controller that will dose and control fans according to the parameters set by the grower. A fibre optic cable enables the Compugas to be located in the growing area. "Autocalc" does all the hard work for you and will provide recommended dosing and fan times according to the size of the growing area and CO2 levels needed. Requires some wiring to install. £ 184.00 _____________________________________________________________________  Elite 800 Air Pump .   Elite 800 Air pump, add an air pump and air stone to your system to introduce fresh oxygen to the nutrient solution. A simply and proven method of obtaining greater growth from your plants and maintaining healthy roots.  £13.99           _____________________________________________________________________