Stabilises PH levels: Effervescent Co2 tablets that provide carbon dioxide directly to the plant's roots.

Biogreen CO2 Tablets are effervescent tablets that provide carbon dioxide (Co2) directly to the plant's roots. This helps stabilising the pH level in the nutrient mix.
 
It also improves the rate of growth and overall resistance to environmental stress.
 
Co2 tabs have an added 1.2% magnesium sulphate to prevent deficiencies and also contain sodium citrate to help keep the pH level stable in your nutrient reservoir. This is really important when growing with organic nutrients.