I have them on the compost which is pretty dry now. I didn't clean them as was unsure how to do it and was more worried about keeping them in the same position although thinking about it now I don;t think it matters just after they are laid. The soil on them might make it hard to see chalking but the candeller does work pretty well. I have put a tub with water in and hydrometer is reading 70 - 80 %
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