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Huh, I hadn't thought of this.
Used coffee grounds are a common fertilizer in gardens - you can get big bags of grounds for free from Starbucks (I do it all the time). Makes a great slow-release nitrogen source.
I don't think I'd put grounds or beans in a hydroponic system though. Too much chance of clogging. Don't see why you couldn't just pour a little brewed coffee in, though. (Just cool it off first.)
It's organic. What's the worst that could happen? The big question would be whether it would provide a stable reduction in pH.
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