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2017/08/18· Feed Me, Seymour Fertilizer prills may be small, hard yellow balls lying on the surface of the soil. These granules contain nutrients and they are covered by a semi-permeable membrane to allow water to penetrate.

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Very nice tutorial that you have here. Would it be possible to mount a 200 to 300 mesh screen on the side of the ball mill in order to allow the small particles of powder to fall out of the mill as such are produced?