28 Bags of Slate Chips

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I have 28 bags of used slate chips, which my gardener has cleared for me. The bags are more or less half full and are the standard DIY/rubble sized bags you get in Sainsbury's and Waitrose. Please note, the chips are VERY HEAVY, which is why the bags are only half filled; if they were full, it would be very hard to move them. ALSO, please note, as these are used, there is a certain amount of earth mixed in with the chips. Because of the weight, you will need a large van.