Exhale
ExHale CO2 bags: a cultivated fungus in a breathable bag that gives off CO2 for months, hung above the plants. The simplest CO2 there is.
In StockExhale
£26.96
About Exhale
Using it
Hang the bag slightly above the canopy so the gas falls onto the leaves, and keep it in place for up to six months. It helps most in a tent that isn't extracting flat out, so turn the fan down when you can.
Related
Generators, bottled CO2 and controllers for a sealed room are under CO2 Equipment.