Thanks, it sounded to good to be true, the link to the thread was very helpful...just got back from buying more BBB.
On a side note, when we opened the pool for the first time this year, of course the pool store guy recommended a new Nature2 cartridge. After finding this forum, and avoiding the purchase, I made sure that the vessel had no old cartridge in it.
Kind of interesting that these manufacturers make a lot of generic claims, but scientific data is minimal at best. Brings me back to a post somewhere on this forum, 'when there is confusion there is money to be made'.