Would chemi-pure be able to replace both carbon and bio rings? I currently have bio ring and carbon in my canister filter. I replace the carbon about every 2 weeks to control tank odors. I have read about chemi-pure and that it is supposed to last 6 months. Does this stuff really work as long as they claim and will it be as effective as my current setup? If so it will save me money not having to replace the carbon so often.