It is a white ball grain, with a high volume for removing fluorine, good physical function, high intensity, non-toxicity, non-sm It is ... a white ball grain, with a high volume for removing fluorine, good physical function, high intensity, non-toxicity, non-smell. It ... -0.42Crush StrengthN/ granule≥45≥35≥10≥40≥60≥100 Activated alumina fluorine killer