Proteam Metal Magic is HEDP. Unfortunately, most metal control products out there have stopped listing there ingredients. The Kem-Tek product:
Kem-Tek 338-6 Metal & Calcium Eliminator Pool and Spa Chemicals, 1 Quart
is 20% HEDP, where Metal Magic is 50 - 60% HEDP. Robelle's metal product appears to be about 10% HEDP. Unfortunately, Amazon is listing the Kem-Tek product as 2+ week delivery. However, check the Kem-Tek page for alternative retailers:
http://www.kem-tek.com/kemtek_produc...um-eliminator/

The BioDex products appear to contain something else.