Cookies and Sour Punch autos

2 mg of Calcium in my area... in a big city like for example Toronto it's 38 mg/litre. Soo read your local water report before buying any nutrients.. Unless you plan on using R/O water.

I don't use cal/mag at all... it collects dust on the shelf. And I don't have hard water :) I live in the mountains so it's some of the cleanest water... Would depend on the Nutrient combinations.... Using organics and chemical based nutrients does not always equal a great idea.

Yeah you can use bottled nutes.