John,
Do a search for Nature 2 and you will find LOTS of posts on this topic. Everyone seems to agree that it does nothing that can't be accomplished with BBB or SWG except drain your wallet. There is "some" truth behind silver/copper ion systems for sanitizing water but the pool enviornment is not ideal for this. Scrap the N2 (you can leave the housing with no cartridge or remove) and use the savings on beers!