I have the N2 and use the grocery store method. No problems here at all. I bought the new cartridge this spring and had it hooked up, then started to care for the pool. My wife did it previously to that and just did whatever the store told her to. Well, I finally wanted to learn, so I found this most awesome site, and have never looked back. But I do have the N2, next year I won't replace it, I will be using the spot it used to occupy to put in a DE filter so I can valve between the sand and the DE and have the best of both of those worlds.
If you have the N2 and it is hooked up, then just leave it, it does not hurt anything that I can see. I think that the thing is that with proper maintanance you just don't need it, that is the thing.
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