"Phil O'Connor" wrote in message
...

Maybe I'm misunderstanding what 'efficient' means. Is efficient BAD?
(meaning
higher nitrate production per DOC input) I guess that makes sense.
Therefore, filter media, being more efficient, is undesirable. Do I have
that
right?

Phil (still me, just posting from my work)

I guess you can put it like that.

CapFusion,...