ah, so I divide by the weight of the nutes. I'm having trouble with your math though. So, Let's assume I'm going off the mixing ratio of 2:1 (MB & CA : MS). (The actual mixing rations on MB's website is wack.) A lot of people do 12g MB&CAL with 6g MS.
So, at full strength, with all 3 together- master blend, epsom, calcium I would divide the NPK by 2.5 (because the epsom is half the amount of the other 2). So regardless of the amount of nutrient solution, it looks like the final NPK is 7.8-7.2-15.2. Is my math/understanding correct?
Thanks for the help!