... , good hard water -resisting, it has strong work ability, but no metal-iron flocculation or deposit. NameHigh Active Fulvic Acid (FA ... , good hard water -resisting, it has strong work ability, but no metal-iron flocculation or deposit. NameHigh Active Fulvic Acid (FA ... , good hard water -resisting, it has strong work ability, but no metal-iron flocculation or deposit. NameSuper Active Fulvic Acid(FA ...