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The instructions for the warming cable state 'keep sand moist' but also states 'sand must not be wet how do you keep sand moist without wetting it?
I am new to this site and found this thread really useful. I bought a soil warming cable with my greenhouse two years ago but haven't got around to using it yet. Plan to do it in the next couple of weeks. Is there an ideal depth for the box? Is it practical to put compost directly on the top PVC layer rather than using trays?