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For advice on decorative surface aggregates see [[Stone]]
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],  
*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],  

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