Glenn-

I am surprised by your 8 month number. My Spectra backflush runs once a
week, and uses 3 gallons of fresh (chlorinated) water per flush. That is
only 106 gallons in 8 months. I don't have the charcoal filter specs, but
the element is at least 6 inches tall -- pretty big.

Of course, the Spectra manual states that the charcoal filters only last 6
months in service, so maybe it's a time, and not a volume thing? The
charcoal filter is only used for the backflush -- it isn't in-line with the
house water.

Best,
Paul
s/v VALIS

"Glenn Ashmore" wrote in message
news:EcgZb.5743$23.1670@lakeread04...
There is a limit to how much chlorine an activated charcoal filter can
absorb. If the charcoal has not been changed in 8 months of flushing
with city water it will make very little difference.