anybody know for a fact if phos-x is an aluminum based product or iron oxide based? Looks to be iron as it is rust colored. A guy brought in a few brand new boxes of it to work for me. He has a fresh water plant tank and was trying to remove all of the phosphates from his water until I told him that plants need phosphates! So I have a few boxes here unopened. Should I use them on a mixed reef or just send them back home with him? Thanks!!
ps - i typically use phosban and rowaphos on my system now (when i need it)
ps - i typically use phosban and rowaphos on my system now (when i need it)



