aha!
I'm another satisfied JBL Ferropol user!
And another thing i found good is...JBL Ferropol 24(contain higher Fe i guess?)
Not to say i'm advertising, but it's good for my Ludwigia repens(hope i get the name right), after i dose that daily, it really brings the red of the ludwigia come out. And recently i used up my Ferropol 24...and after few days of not dosing it, the Ludwigia's new leafs are fresh green color again...

Regards,
John