I would like to add that Purigen shouldn't be used with some 'slime-coat' products/water conditioners(amine based) as these react with the Purigen making it toxic. The best water conditioner to use with Purigen is Prime.
This was copied from Seachem.com - Purigen FAQs:
Just a heads up for those unaware of this.
This was copied from Seachem.com - Purigen FAQs:
Q:On some of the Purigen™ documentation I have read it says that some slime coat products can contaminate Purigen™ and render it toxic. Can you identify these products ?
A: Only certain slime coat products will cause Purigen™ to become toxic; the products that do this are amine based. Prime™ and Safe™ are not amine based and so will not cause this problem. If you're curious, what happens is that the amine compounds can strongly bind to the resin, then when they (the amines) come into contact with any chlorine they will form chloramines which are highly toxic. We offer a stress coat product, StressGuard™, which is not amine based and so can be used in conjunction with Purigen.™
Just a heads up for those unaware of this.