Jeff,
As others have said here, there is still a bit of the "unknown" as to the direct causes and treatment of BER. My own experience in EarthTainers has been very variety dependent - - some varieties like Big Beef have NEVER experienced BER, where others seem more prone to it.
The "good news" is that over time, the percentage of BER afflicted fruits diminishes, and by the mid-Season, it will be mostly gone. I know it is tough to be patient - - but hang in there. The good news that you reported is about the really healthy plants!!
Raybo
