Hi Sue –
When using Age Old Soluble Mycorrhizae in an EZ-Flo injector system you will want to first create a concentrated stock solution from which to draw the product out for further dilution. Here is a rate that would work well.
Add 50 grams (approximately 6 tablespoons) per gallon of water in the EZflo tank and mix until dissolved. This concentrated solution can be pulled through the system at either the 1 tsp or 1 tbsp rate. At the 50 gram per gallon concentrated rate it will take around 10 lbs of Soluble Mycorrhizae per 100 gallons of water. Since this is a concentrated solution that is further diluted, each gallon will stretch pretty far.
Hope it helps!