Just like the title says, nitric or phosphoric.
Been using the nitric for a while and curious
to the benefit, if any, of one over the other.
12-15 drops per 64 oz of nute solution, yields
pH from 5.8 - 6.2 for me and my conditions.
My filtered water is 0.1EC, pH average is 6.5.
I do GH 6/9 with epsom, SM90 and Pro tecKt.