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

Australia
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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
 
You could bed the pipes in sand also.
5 to 7 mm range is what we bed our pipes in
We call it '1/4 minus'
 

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