noah wrote:

Also, the chlorine in domestic (shore supply) will evaporate or be
used up after a while. If you don't use it frequently, you may still
need to add a bit of chlorine from time to time.

Not the best idea, Noah. Only the purifying properties in chlorine
evaporate...the corrosive properties remain behind. Any added chlorine
will only do the same thing...so adding more only shortens the life of
water pumps and aluminum water tanks. An annual "shock
treatment"--provided it's complete flushed out after it's been in the
system long enough to do its job--won't harm anything...it's the
cumulative effect of small amounts of chlorine that do the damage. An
annual--or at most semi-annual in a tropical or sub-tropical
climate--recommissioning should be all that's needed to keep the onboard
water smelling and tasting as good as any that comes out of a faucet on
land if it's just replaced frequently. If what comes out of the faucets
on land isn't good enough to suit you, install a filter. Just remember,
though, that filters do need periodic cleaning and/or replacment...and
that they should only be used in addition, not as a substitute for,
system maintenance.

Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/html/get_ri...oat_odors.html