I was also talked into buying a Nature 2 from my builder. It is just another way for them to make money if you use them to open your pool. I asked a similar question last year. Replies were that Nature 2 did so little switching to bleach and store chems was not a problem. It adds a negligible amt of copper if any. I switched and no problems. I also removed the cartridge a few weeks later which is probably your best bet.
Now if I can just figure how to re-plumb the pipes and can remove the canister and sell it on e-bay!
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