CuLator Ultra PowerPak
CuLator Metal Eliminator and Stain Preventer, removes and eliminates copper, manganese, and iron, from pool and spa water.  CuLator is nontoxic and works in fresh and saltwater.  Simply place a pre-measured flow-through Ultra PowerPak in the skimmer or pump basket. As water passes over, metals are trapped inside.  After use, toss the biodegradable Ultra PowerPak away!