> Don't forget that unlike a water supply line,
> the hot tub plumbing has only a few pounds of
> pressure.
Well, if you consider 30+ psi to be "only a few pounds". Truck radiators
also usually lack free chlorine, while I have to take my pool up to 3ppm at
least twice a year or so. Chlorine is incredibly destructive (which is why
it works so well at killing *anything* that grows).
Randall
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