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Re: Pool Stains - unsure what kind and best way to proceed
Re: testing - use the 10ml / 0.5 ppm sample. That's more accuracy than you are likely to ever need. I can't even think of an occasion where it would have been nice to know chlorine levels to the nearest 0.2 ppm.
Last edited by PoolDoc; 05-19-2014 at 03:52 PM.
Reason: remove extraneous Amazon chit-chat
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