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Hold in position with bulldog clips. Step 3 Add 25mm of scoria to base of the bed. Step 4 Coil agricultural (ag) pipe around scoria bed, with cap end sitting on rim of garden bed. Cover pipe with ...

These brick-shaped building blocks are known as Copperhouse slag or scoria blocks. This is a typical example. They were cast from the residue of the copper smelting works that operated at ...