The bottom is filled with a special compost that has aged for some years, screened and dried over some days in the sun. I have set a 2-4cm layer direct on the bottom. Then rough black Lava sand 4-12mm, 5-10cm above to get a flow through it, these is then covered with the same lava sand 1-2mm. I fertilise with self made clay balls where I added my dry fertiliser and CSM+B and Iron Chelate. As you can see on the pictures the plants are doing fine.
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