mad farmer? new to me, but they do say they use different acids to control phosphorus lockout. never experianced it personally and i use a nice amount of ph down with water reaching 7.8-8 after sitting out over night.

sounds like a ph prob, u should fill out rustys form

i usually curl down when my ph is a lil hi like 6.9 -7 from 6.5 oh yeah disclaimer (this is not a diagnosis)
phatsesh101 Reviewed by phatsesh101 on . PH down= phosphorus toxicity? Im trying to figure out a leaf curl problem and talking to my guy at the hydro store we were going over some possibilities and he mentioned something about adding phosphoric acid may lead to too much phosphorus in the solution anyboby hear of this?:hippy: Rating: 5