Watering with RO

I have a question. If I water my plant with RO I understand I need to mix a teaspoon of calmag plus with a gallon of water then mix real well. I got that down. But do I need to use the teaspoon of calmag with RO every time I water?

What type of grow are you doing? What is your medium? What stage of growth are your plants?

I mixed up a buncha good dirt, compost, an more good fertile soil an it's growing in that. Gets bout 7 to 8 hours of direct sunlight. About mid March is when It started. just reached the close to 7th node, showing all 9 fingers.

Im sorry, Im just getting started with hydro myself and I am ignorant to the intricacies if soil growing. Best of luck, I know someone here will be able to help.