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