I use a diy inline reactor, and I have no idea how much co2 I am adding into my tank. I just look at the bubble counter and if it looks like a good flow rate I go with that. One of these days I need to get something to measure it with. I am adding 2 tablespoons of Leaf Zone once a week; twice a week I add 1/2 teaspoon of KN03 (Potassium Nitrate) and 1/4 teaspoon of Kh2S04 (Mono Potassium Phoshate). That is when I remember to add it.
What do you mean by; that big sword plant is going to drive you batty one of these days?