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For my Walstad bowl I sifted my potting mix using an old window screen over a bucket. 8 pounds of mix yielded a little over 2 pounds of super-fine soil. Your mileage may vary depending on the brand of soil used (I did not have access to the organic Miracle-Gro and had to use a different organic soil).Well if I can keep this topic alive: I am looking specifically for a method to sift the planting soil...in my case im using organic black earth that i will sift and then cook to sterilize. Looking for an efficient DIY sifting method?