I had N2 that I bought when the pool was installed last year (before I found this site). The warning about not using BBB with N2 relates to the potential addition of copper by N2 which could cause a problem. The general belief - but not proven - is that N2 does so little it does not negatively impact BBB. But since not proven buyer beware.
I removed my cartridge within 2 months of use and had no negative impact using BBB. My suggestion would be to do the same and just go with BBB. The main risk I see with N2 is the suggestion you can maintain your pool using lower free chlorine levels than recommended here. That would be dangerous.
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