Good Morning Everyone,

When I first bought my tank, I bought some Purigen, but I never used it.

When I opened it up, I put have into a plastic container with water, and the other half in a ziplock bag. They have been sitting this way for about 7 months now.

The one in the plastic container has turned a redish/brown container. Do you believe i could recharge this, and still use it?

Do you believe the half in the ziplock bag would still be good?

Recharge it and see if turns white, then you are gold.
It can be revived multiple times, I am using the same pouch for more than 5 months and recharged thrice.

I agree with Watercrayfish - just add some bleach and let it recharge. It happens pretty quickly so you will know in a minute or two.
Do Not use the "no splash" type bleach - it's thicker than usual. Plain old non scented bleach.
Rinse it until you think the smell is gone - then have someone else sniff it. Your nose becomes "blind" to the smell after a while.