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Optigrun Intensive Substrate Urban Soil is used as a vegetation substrate for intensive multi-layered green roofs. Specifically designed for growing vegetables and berry bushes on garden roofs with 0 - 5° roof pitch. Total pore volume:57 Vol% Max. water capacity:48 Vol% Salt content:0.4 g/l Organic substances:29 g/l pH value:7.76 Weight when saturated*:max. 1,650 kg/m³