I used a generic store brand that I purchased for this purpose. No additives like anti-biotics. I used about 1//4 teaspoon in my 26 oz. spray bottle. Good thing I "experimented" on just one of my JIs. Since then I have been able to get that one going again from a couple of small pieces of rhizome I cut away.
Lefty, what do you use to adjust the pH of your municipal water? It seems like it would be difficult without buffering. A local nursery uses sulfuric but I bet they have it down to a "t" just how much to add. Our city water is alkaline (pH 8.4) but this is due to their adding sodium hydroxide to get that pH. When they first did that it cost me a vet bill for my cat because it made her sick!
I have collected rainwater all through winter and spring and have a large tub of it. I'll use that on my JIs until I run out. I may want to acidify my water after that as JIs are not very tolerable of alkaline soil or water. In lthe meantime, I am shopping for a good pH meter...
