I've used Chemi-pure before with decent results. I didn't find that it removed many of my nutrients (a little
NO3 and
PO4, but not considerable amounts). I would however recommend Seachem's Purigen over any other chemical media out there. It works amazingly well, does a great job polishing your water, and is easily rechargeable. You'll need to get some fine filter bags to put it in, but it's great stuff