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Why Does My Ph Go Up Every Day? Will I Ever Stop Adding Ph Down?

I have a 40gal Rez for my flood tray. it only takes about half the rez to fill the tray, but from what i understand the bigger the rez the easier to stabilize the PH and EC/PPM. from the first day i got my nutes up to 850 ppm, added PH down to bring it from 7 to around 5.5 (my meter broke so i'm using the vial and dropper type) i go back 12 hours later and the PH is back up to around 6.5 or 7. it does this when i dont add anymore water or nutes or when i do, it is always up 1 to 1.5 points...

Why Does My Ph Go Up Every Day? Will I Ever Stop Adding Ph Down?


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