cal-mag 4 rain water?

96tears

Member

• Feb 14, 2020

• #1

I have a indoor soil grow and have captured Rain Water and was wondering if adding cal-mag is a necessity or a option?

 

EliteCultivation

Well-Known Member

• Feb 14, 2020

• #2

It's an option.
Rain water has a higher content of calcium and magnesium so cal/mag should only be added if necessary.

 

Chip Green

Well-Known Member

• Feb 14, 2020

• #3

My rainwater, was showing less than 10ppm. As does any reclaimed snow, in my experimentation.