I's not a problem at all, Patricia.
Soak the Purigen bag(s) in a 50/50 solution of common household bleach and water overnite (24 hours), rinse well in de-chlored water when it has turned white again, and you're good to go once again. I use it for 2-3 weeks at a time, re-place it with a second bag I always have on hand, while the first one is re-charging, been rinsed up, and good to go again.
And that makes it real inexpensive, as you can re-charge it up to a dozen times, or more, before it begins to lose it's effectiveness.
Try it, I'm sure you'll like the results.
I've been using it 24/7 in my planted discus tank for over 3 years now, and wouldn't be without it.
My tank water is crystal clear all the time, and it gives me confidence that it's also constantly removing various potentially harmful impurities, thus producing better water quality and conditions.
That's my .02