[AquaticLife] Purigen
You might direct that one directly to the Sea-Chem folks. I’m not sure any of us mere hobbyists would have the testing equipment to know the dissipation rate of damaging amine compounds. 
When I first started using Purigen a couple of years ago, I had never used any slime-this, stress-that type products so I never had to worry about that aspect of the product but I remember reading about it when I was first reading all that I could find on Purigen.
Me and my fish are happy with using it so far and I have to “clean” it every few weeks due to my “dirty” goldfish so I have two 100ml packages that I alternate using as the last line of filtration in my canister filter. I really like the fact that you can tell when it’s “dirty”, unlike when using a lesser chemical filter media like activated carbon. With carbon, you just have to throw it away every couple of weeks not knowing if it still has life or not. With Purigen, it can be recharged over and over and keeps on working… although Sea-Chem seems to imply that it can only be recharged a certain number of times but it certainly keeps working for me after many, many recharges.
When the Purigen gets “dirty” (brown) I simply use the 50/50 bleach solution and soak it for 24 hours. Then rinse it well and soak it again for 24 hours in a cup of water with 20ml of dechlor product added (I use API’s but any basic dechlor product will work).
I DO NOT go the extra step of soaking the Purigen in the buffer solution that Sea-Chem suggests for FW tanks since my own testing shows it doesn’t do anything when your source water is on the hard side. If your source water is on the soft side or low-pH side, then the buffer soak step may be needed.. Goldfish and most cichlids prefer harder water and higher pH so if your cichlids are the hard water/high pH type, then you could skip that step also and save some time and money. Sea-Chem doesn’t suggest the buffer soak when Purigen is used in SW tanks so that also leads me to believe that step is only needed in softer, low-pH water tanks.
Lenny Vasbinder Fish Blog - http://GoldLenny.blogspot.com
Category: Philippines Internet Koi Society
