I see that many use Lucas' formula for the GH 3-part nutes. So far I've had pretty good results with Highgrade's formula that I found on Overgrow.com under growfaq 92.

The 1st number is the Flora-Gro; 2nd is Flora-Micro and the last is Flora- Bloom. You use a ratio of 3-2-1 during veg, 1-1-1 during transition and 1-2-3 during flower. Meaning that in veg you use 3 times the amount of Flora-Gro than Flora-Bloom and 2 times as much Flora-Micro as Flora-Bloom. So if you are using 5 ml per gallon of Flora-Bloom, you should use 10 ml per gallon of Flora-Micro and 15 ml of Flora-Gro.

At transition you use equal parts of all three. Then during flower you use 3 times the amount Flora-Bloom than Flora-Gro and 2 times as much Flora-Micro as Flora-Gro.

That's how you get a 3-2-1; 1-1-1; and 1-2-3 ratio. GH also has a ppm calculator online to help you estimate your ppm level before mixing. I mix my nutes at two-thirds to three-fourths the GH recommended nute strengths and then backoff the next water change if I need to.

Im' still tweaking the formula for my strain of plants.

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