I tried em all.. Calmag has nothing to do with npk ratios though... If you need calcium (not calmag) you should use calcium.. Part 2 is 15.5-0-0.. So you're not just adding trace amounts of calcium.. Your adding a sh*t ton of nitrogen with nothing to balance it out.. I've never seen any cannabis nutrient with a npk ratio of 15-0-0.. That's just not a cannabis ratio. Neither is the 5-12-26 of part A.. That's just not balanced for cannabis.. But I wish ya success with it, like I have everyone else who's used it! I hope you kill it!