I have both Amquel and Amquel plus
My Amquel plus is a smaller bottle with less room for label and mentions the dyes.
My new Amquel barely says anything
The big bottle is original amquel
My medium bottle is older label with the fish in a lifesaver and has scads of info too.
AP Stress coat also claims to detoxify heavy metals..all those dye treatments are
New an old has the same patent number so I doubt there is any change but the package.
metal based.Plus may have already included addition of the coating agent like Novaqua or PolyAqua. We ran out so I can't see it's label after all.
I think there might be an actual problem here. Now that I look at all my instant water agers...they almost all have claims against metals.