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I just tried to restore my purigen and it looks like it is still brown. This is relatively new purigen, and this is the first time I tried to regenerate it.
Mine stayed brown even after a couple of day long bleach soakings. After thorough rinsing and soaking (with Prime added) it smelt like a dead carp on a 100 degree day. Sorry so graphic, but it really smelled.
So this is a comparison of two new packets and the two old ones that I left in bleach for 2 weeks, then in seachem safe, then seachem neutral regulator
They never turned close to what they were before, and actually seen smaller in size also.
Oh well, all 4 going into te fx6