Xtreme Gardening MYKOS Root Paks are the all-purpose method of applying MYKOS mycorrhizae for hydroponic systems with loose media (such as Growstone & Hydroton). Each pak holds 10 grams of pure mycorrhizal inoculant. The microbes inside each pak benefit plants by creating a "sponge-like" mass which collects and stores nutrients and water, increasing the uptake of both. This single species of arbuscular mycorrhizal fungi contains only Rhizophagus intraradices. MYKOS Root Paks do not contain any other microbes such as Trichoderma or ectomycorrhizae.