That's just it, quarter tsp per gallon. But, I've been cautioned at every turn by everyone telling me how strong the shit is. And the last thing I want to do is fuck up this late in the game.
If you’re only using cha Ching you can use up to 1tsp per gallon, if you mix with other nutrients I’d recommend 1/4 tsp per gallon. I use cha Ching myself