I mixed some 322 per the direction on the earthtainer instructions using Mg potting soil, pine bark fines, and perlite. It was quite gritty compared to what I had done by trying to remix 511. Also I had used peat and not the potting soil. The potting soil does already have some bark and perlite so I can see using that would add drainage. Also the extra perlite added to to grittiness.
Wish I could get promix but just can't find it.
Will try some more cucumbers in this mix and see how it goes.
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