which chemi pure? There are cheaper alternatives, but chemi-pure just makes it easy since its already in a bag with minimal rinsing ready to go.
Many reefers have used their product line with great results, but again, there are cheaper alternatives.
I believe the reg. chemi-pure is just activated carbon. You can just get some BRS Rox and put it in a media bag and have the same effect.
Chemipure Elite is Carbon+GFO. If you're goal is to control phosphates and can do a reactor, GFO is a cheaper and more effective alternative in the long run.