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I found a source of the smaller chip it is about $11/ 5 lbs - it is 90% Sulfur - 10% bentoite clay. Wish is were the large ball (have had very good luck with Midwetaquatic on a smaller tank with the old small chip media for over a year now). I have recently gotten a slowdown in flow. I contacted Midwest twice and have not gotten a response. If this above media would work it would be about $25 / 5kg. - I think about 2 gal. (or just less).
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