Idrogrow's CO2 Tabs extra slow release frizzy tablets containing an high quantity of Carbon Dioxide: put one of them into a glass of water in the grow box and it will release the CO2 in the air for the foliar uptake or you can put them directly into the nutrient solution for root uptake.

We suggest to use two tablets into a glass of water for spaces of one meter square, switching of the extractors fans for a few hours.