Warning- bad carbon will kill

[o.c.d.]

I just tried the magnet test on unused Korallen or zeo carbon and elite aquatic premium carbon and they both were picked up by the magnet. Not sure why but my question now is, How accurate is this procedure. Can everyone with a strong magnet test their carbon please. So far Black diamond,HBH,Korallen,Elite Aquatic premium. all are magnetic

[mws]

I tested my Kent marine reef carbon and magnet picked up a few pellets too.

[my2rotties]

I don't have corals but have been using the stuff for a month with no ill effect on anything. I honestly thought it works fantastic. The only thing I have noticed since using it is diatoms, which prob have nothing to do with the carbon. I never had an issue with them before.

I do see little rust spots in my reactor though, but maybe two or three little tiny pieces.