rkymtnman
Well-Known Member
i added epsom 1g/gal with it. it's low on Mg big time.One thing to keep in mind is that FPro has virtually no sulfur, and only 2% Ca and 0.5% Mg
I've used Fpro with rockwool without issues, with coco it needs some help.
my well water has all the Ca i need.
but yeah, if using RO, i'd probably use cal/mg and maybe a touch of epsom for the Su