Canna Coco Part A & B works great for growing medicinal marijuana in a coco coir medium. Grow from seed to harvest using ONLY this two-part nutrient mixture. Transition from the Vegetating phase to the Blooming phase without having to change your nutrient mixture, all you need to do is change the light cycle.
Canna does not recommend a starting EC value, as they are assuming that there is some sort of ca/mg present, whether it's in the water already, or if you're adding it before you mix your nutes. .2 EC is what they assume water that's LOW in ca/mg to be and .4EC is what they consider Standard Water. In the drop down for hardness level, you would select what you know about your source water first, and the starting EC assumption changes. If you are using RO water, add ca/mg to the manufacturer's recommendation by volume, not EC (the ca/mg manufacturer) - and don't really worry about it being exactly .4EC. I mean, if the label says mix 4 mL/gal then do that - don't mix it using EC. Then set the online calculator to Standard Water and it will calculate everything including your expected ppm.
6 years ago