It's up to you about whether you think recharging purigen is worth the effort. I do it because I find it incredibly easy not to mention cost efficient. I've been running (by alternating) the same 2 purigen pouches I bought when I started the tank years ago and they work good as new.
I use a mason jar (any kind of jar/tupperware will do) for the process which makes it super easy. When the pouch gets dark I put it in the mason jar with 50% bleach overnight. Shake it every once in a while so all the beads get exposed. If the pouch was
particularly nasty sometimes i replace the bleach in the morning shake again and let it soak during the day too until its sparkly white again.
Rinse well in tap water to get out most of the bleach then add water/prime to the jar. I don't even use as much prime as they recommend. I use about 5x dosage then leave it till the next day. Sometimes I leave it a couple days because i get lazy or forget...
Purigen isn't supposed to dry out entirely so I then drain it and toss it into a ziplock bag for a few weeks until the purigen in the filter is ready to be recharged. At this point it's been sitting damp for a couple weeks so even if there WAS any residual beach it would have broken down, but just for my peace of mind I always do a water change the day i add fresh purigen. So there is prime in the tank too. Completely unnecessary, but it makes me feel better to have that extra safety net.
lol, super easy, and you have sparkly new purigen for the price of bleach and a few drops of prime.