Don't dilute it, honestly you have no idea how much of it is still alive and active. They say to replace it every 6 months if there is any left by then. It isn't something you need to be super careful about. I give 5 ml per 3 gallons every 2 weeks, and use 1 ml per liter for foliar-Southern Ag Garden Friendly Fungicide (bacillus amyloliquefaciens) is one of the single best products you can buy for your grow. It really works, read up on some of the studies done on it...increases growth rate/yield, induces SAR, prevents root rot, PM and Botrytis (foliar). Besides a good complete nutrient, I would not be without it. The only other products I add are hydrolyzed amino acids, kelp extract, and chitosan, and I would buy the Southern Ag before any of that stuff.
