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I wouldn't use coffee, I'd be worried about promoting mold growth. Mold loves coffee.
When I first started growing hydro I tried using household stuff to adjust my ph, and you could adjust it fine but it was never stable. You always had to retest and readjust just about every time you visited the plants.
Just buy the PH up and PH down from your hydro store. It's so much easier than trying to MacGyver something from your pantry.
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