I dose it hourly and the instructions are kinda janky. What you need to do is dose up to a healthy number such as 6ppm. You probably will have to dose quite a bit more than the instructions state. Basically dose the suggest amount, wait an hour, test, repeat if necessary. Once you get a good starting number, stop dosing and measure the level again in 24 and 48 hours. This will give you a good idea of your starting dose based on daily consumption.
So say you start and undetectable and dose 30ml to hit 6ppm. After 24h your at 5ppm and at 48h you’re at 4ppm. That means your tank is currently consuming an average of 1ppm per day which based on the loading dose is ~10ml.
Keep in mind the dosage will change over time (weeks/months).