Super char powdered activated carbon 
Its carbon for my vortex xl diatom . Im not sure of the quality of this carbon in regards to PH change and phosphate content. I like to use carbon to help remove heavy metals that come from the well water (and water polishing) . Thanks guys
ANY EXPERIENCE HELPS!!
Theres no real specs I can find on the stuff
http://www.aquariumguys.com/superchar.html
Its carbon for my vortex xl diatom . Im not sure of the quality of this carbon in regards to PH change and phosphate content. I like to use carbon to help remove heavy metals that come from the well water (and water polishing) . Thanks guys
ANY EXPERIENCE HELPS!!
Theres no real specs I can find on the stuff
http://www.aquariumguys.com/superchar.html