... 20kg /bagFeatureIt has good chemical and biological active, good hard water -resisting, it has strong work ability, but no metal-iron ... 20kg /bagFeatureIt has good chemical and biological active, good hard water -resisting, it has strong work ability, but no metal-iron ... 20kg /bagFeatureIt has good chemical and biological active, good hard water -resisting, it has strong work ability, but no metal-iron ...