I would like to share a little info with you today. I use jacks classic 20-20-20 for veg and 10-30-20 for flower. I do not PH. I don't have too, it is buffered and when mixed with standard TAP water will PH at 6.7-6.8. I only PH when feeding straight water or calmag which I like to feed separately. You can mix jacks and calmag together without PHing but you want to mix in the calmag first. I haven't had to PH for over a year now and I like it. Just throw a pump in your bucket, a little jacks and your good. Starting dose for a 6 day old seedling, 1/4 tsp/gal. then go from there. Banner is doing well with 1/4 so far. Peanut Butter Breath gets 1/2 and she's just now about greened up. I bought one 1.5lb. tub of each and unfortunately it may outlive me, I'm 66. If you decide to try it, start on a new grow. Disclaimer: I do not profit from any product I use or mention.