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Line 1: For advice on decorative surface aggregates see '''[[Stone]]''' *Granular material for underdrains should be clear crushed 20 or 50 mm diameter stone graded in accordance with [https://www.astm.org/Standards/D2940.htm ASTM D 2940], *The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer,*The void space ratio should be > 0.35 (or > 35%) All gravel should meet the following criteria:*Maximum wash loss of 0.5%*Minimum durability index of 35*Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions [[Category:materials]]
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Did you want an article on [[Reservoir gravel]] or [[choking layer|finer gravel]]?