Well......the place I got the coarse clay was already flattened. The ground was rock hard and most of the soil surface was other kind of sediment. So I just dig a little and I found coarse clay, Robert.
Thanks for helping all of you. Am I suppose to wash it thoroughly? I did wash it, but I realised that the clay eroded and got washed away. Now I am only left with three quarters of the amount that I collected
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Cheers