I use a home made base of red art clay, peatmoss or peat balls(Dupla), earthworm castings. Boil all this for 20 minutes. This is usually .5 to 1 inch thick.Top this with a mixture of 3-10 mm washed gravel (your choice of colours) with a mix of equivalent mix of sandblasting silica sand (usually plain sand colour) about 2-3 inches thick.
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