Dual Stage Regulator review by Professional Aquascaper George Farmer

CO2 injection adds dissolved carbon dioxide to aquarium water so plants can photosynthesise at the rate their light and nutrients already allow. In a planted tank carbon is usually the factor running out first, so a steady supply speeds growth, fills leaves out and leaves algae less room. A working setup needs a regulator, a diffuser and a way to read the level in the water.