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Size 20 cm x 10 cm x 5 cm Compression Ratio 8 : 1 Weight : 650 grams ( +/- 3 %) Electrical conductivity :< 0.5 ms/cm pH :5.5 to 6.8 Sieve size : 6 mm sieved Moisture content 15 - 18 % Expansion volume 10 - 11 liters per brick