20-5mm Carboniferous Limestone (SUDS Sub-Base)
An ideal material to use as a permeable sub-base. As the size suggests the 20-5mm OGCR is used as the base layer of any foundations. The larger stones will act as a filter, plus allowing the water to seep slowly into the ground.
The 2-6mm carboniferous limestone should be used as a top permeable layer.
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