We've recently had a low (5 bricks high) retaining wall built in our garden, with a 1m deep bed of soil behind it. We're planning on filling directly behind the wall with gravel, but from online research I think we need to put a permeable membrane between the soil and the gravel, to stop the soil just mixing in. Is this correct, and if so, is this a specific product that's different to a weed control membrane? Would anyone be able to recommend a specific product?
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