Diy Co2 For Indoor Plants . The two most popular ways to add extra co₂ to your cannabis grow area rely on co₂ generators or. Fill the container ⅓ full of small rocks or pebbles. 5 House Plants That Will Purify Your Home (And Are Easy to Care For from www.faithful-to-nature.co.za To make the fertilizer, you need to mix 0.5 tablespoons of water with 8 tablespoons of wood ash and tooth powder and 4 tablespoons of copper sulfate. Sealed grow rooms and co2 safety. The dangerous chemicals it helps remove include formaldehyde, toluene and xylene.