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- #1,081
I saw a post on another site that I thought really summed up the PPM and PH relationship in hydro nicely - thought I'd share (slightly reworded for clarity and simplicity):
PPM's go up, PH goes down: Plants require less nutes.
PPM's go down, PH goes up = Plants require more nutes.
PPM's stable, PH goes up = Equilibrium (Ideal)
PPM's go up, PH goes down: Plants require less nutes.
PPM's go down, PH goes up = Plants require more nutes.
PPM's stable, PH goes up = Equilibrium (Ideal)