Aquaponic Gardening

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This has probably been talked about before. I have not searched too much in the archives. I bought a bag of river pebble at Menards. I scooped up a jar full, washed it, and filled the bar with vinegar. It bubble profusely for a couple hrs then the bubbles pretty much quit. Is that stone usable? How much bubbling is too much bubbling?

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In order to use those rocks you would have to seen no bubbles at all. so I will recommend that you don't use that rock. if that is not an option then keep exposing the rock to vinegar until the rocks no longer create any bubbles. 

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