Big_John said

What you want to do is add a metering valve to the bottom of the hopper and get rid of the pickup tube. Turned mine into a completely different machine that works so much better. I just have to keep a couple cups of media in it too. You add a cup of fresh media every once in a while to replace the old that got broken down and sucked up by the vacuum.

Listen to this guy, and then search for other videos on the subject.

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