I don't think so. I ran a MJ 1200 on mine too, and if I remember right I had the valve wide open. The tumbling action of the RowaPhos came up the chamber by only about 2"-3". When I first fired it up I remembered thinking...."That's it?". If anything, it seemed it needed more flow. Maybe it was because it was RowaPhos, which is heavier/denser than PhosBan.
Cheers,
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Mark.
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