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Discuss Scoria to protect pressured PVC pool pipe in the Australian Plumbing Advice Forum area at PlumbersForums.net

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Our soil is clay and has moved significantly over the 40 year life of the pool. This caused a leak on two of the PVC pipes. Recently ripped all the concrete covering the pipes up and replaced the PVC. I am asking what the best and most suitable material is to fill in the trenches where the PVC piping sits. Currently purchased 20mm scoria which I am worried might be too thick? Should I go for something in the 5-7mm range? My main concern is putting pressure on the pipes and having another leak. Only foot traffic on top so no vehicular access needed. Thanks
 

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