How often should I use Orca mycorrhizae?

All you need for good healthy roots is to keep your water at acceptable temps for hydro. 62 to 68° is where your MDO (maximum dissolved oxygen) is in water. This is the temp to keep your roots at for the fastest growing roots and plants you can get. For healthy root growth, all that is needed for this is to add a little bloom nutes to your mix for the first week or 2 from sprout. Hydroponics feeding schedule from sprout for photo period plants is 400 ppm 0.8ec from sprout and you increase your feed by 100 ppm every week if your seeing good growth. Stop when you hit 800 ppm 1.6 ec. By then, their 5th week, they should be ready to switch into flower. If your growing autos, start at 200 ppm 0.4 ec and increase until you hit the 600 ppm 1.2 ec mark. Cheers