Can I use cal mag in the same water as I have my vegging nutrients in?

How can I add together or tell ppms?
I'm new to this so I apologize for my lack of knowledge
PPM pen. And just mix in a bucket before using or adding to reservoir. I highly suggest a PPM and a PH pen. A decent cheap pair will keep you and plants happier. My $12 combo that functions flawlessly after a few years. Just keep them clean 002.jpg003.jpg
 
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As for purity of water
yep get some ppm/ph pens, like above.
not sure you will need calmag

its not a magic potion, it must be used in recognized need
If plants like a lower ppm during seedling, vegging, and flowering, does that mean I change the volume of nutrients in my water based on the stage of growth they are in?
 
As for purity of water

If plants like a lower ppm during seedling, vegging, and flowering, does that mean I change the volume of nutrients in my water based on the stage of growth they are in?
Close. I increase PH as I get into flower. My nute PPM's are gradually increased as plant grows and tolerates more. It is a basic principle. We complicate it trying to mix and use urine of Zuess.
 
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