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S.No Description Values 1 Block size 30 x 30 x 12 +/- 1cm 2 EC Level Below 0.5ms/cm 3 pH level 5.8 â?? 6.8 4 Mesh 6mm 5 Compression ratio 5:1 6 Expansion volume 15 ltrs per kg 7 Moisture below 15 % 8 Impurities 5% 9 Fiber 5%