PROBIOTICS by W2G contains a billion little microbial minions that live only to clean your root system! Probiotics contains 16 species of Endo and Ecto Michorrizal Fungi, 8 species of Trichoderma, 57 beneficial bacteria microorganisms with 1.4 billion probiotic colony forming units per every gram. Probiotics are living microbes and thrive in high oxygen environments. For the best results, keep your soil / water temperatures below 25 degrees celcius. Probiotics outcompete and starve anaerobic (bad) bacteria and keeps your roots whiter than snow. Treats 1000L of nutrient solution.