There's a thread about how recharging Purigen can be potentially toxic if you use CSM+B. You've probably seen it but I'd hate for something happen to those discus.
The cause of the problem was clarified. It was the use of certain brands of water conditioners that contained amine-based slime coatings during the regeneration process that caused the Purigen fouling. CSM+B is fine with Purigen.
SURVEY: who uses Purigen and CSM+B