Whole house RO water. Should I use Cal-Mag in every watering?

[Oldgoat]

Hi, I'm working on my first grow and a question I need help with is if Cal-Mag is needed in every watering if using RO water. My whole house is RO water and you don't want to drink, bathe in or smell my well water that out of the tap at the well shows over 1200 PPM.

 

[9fingerleafs]

Yes. Use calmag every watering

 

[9fingerleafs]

Even for drinking RO water is too clean. Bottled water has 10-20ppm. For plants you want 100-200 ppm base of calcium

 

[Oldgoat]

Thank 9FL. I really expected your reply.

 

[Rootsruler]

If you're running LED lighting more mag will be needed.

 

[Bluey]

I'm finding I also have to do this growing in coco with rainwater....which is pretty much the same as demineralised water.

 

[OldManGrower]

It's hard to provide too much calcium. I use calmag at every watering as a preventative measure but I cut back the amount after buds form.