Chemi-Pure Placement

[Terrerin]

OK, I know this might seem stupid, but, recently everything in my tank had died and I got Chemi-Pure (as suggested by Jason) to de-ionize the things release by the corals. The only problem I'm having is that I'm not exactly sure where to put the bag. I have a Back Pack Skimmer and here is a diagram and where I think it should go. Thanks