Nature 2?

[joenj]

A newbie here who got an I/G vinyl pool with the house. It seems the consensus is not to use the Nature2. Assuming I go the B/B/B method, what is the biggest downside of using the Nature2 besides $$$? I've already installed a new cartridge for the season (before finding this site), so I'm kinda worried what negative effects using the Nature2 with B/B/B. The help pages on the main site recommended not using the B/B/B method if the Nature2 or similar system was being used. Would the biggest issue be staining from the copper/silver? Or possible health effects from the Cu/Ag?

Last two years I was using the Nature2(came with pool), and the 3Bs without any problems. This year the canister is empty and will be cut out when I close the pool. I also have an I/G vinyl.