On Sep 13, 2004, at 4:33 PM, Philip Stortz wrote:

> they aren't fooled by water coloration which happens to be a real
> problem with my tap water used in the hot tub.  the test strips never
> show the real ph, and just look wrong.

I have discovered that if the chlorine or bromine level of a hottub is
high, those components will bleach out the dyes used on the Ph and other
tests, leading to unreadable and/or non-sensical results.  If you have
one of the fancier liquid-based test kits, you can use some chlorine
neutralizer before doing the Ph tests, but if the chlorine level is up
over the max of the chlorine test, the rest of those 'strip' tests can
be useless...

BillW

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