[Purigen & Bio Ring can be used in hospital tank?]

Just purchased Bio Ring from Aquarium Co Op, it does not seems like made out of Carbon. Product description does not state  what is made out of.  Hope I could use it.

[Purigen & Bio Ring can be used in hospital tank?]

Thanks for your response. How about Bio Rings and Sponge only? I want to add some type of filer and yet do not want to remove medication. What do you recommend for hospital tank filer system. Thanks in advance.

[Purigen & Bio Ring can be used in hospital tank?]

My two gold fishes got internal parasite, thy are in hospital tank. Removed carbon for medication only active in air pump. Can I use Purigen and Bio Rings to the hospital tank filer system instead of carbon. I want to make sure Purigen and Bio Ring are not like Carbon effect. Medication instructions stated remove carbon bit nothing else stated. Please advise.