How are you maintaining alkalinity? I would back off whatever method you're using. If you're not doing something (ie., reactor, kalk, 2 part, or whatever), that alkalinity has to be coming from somewhere ... salt mix maybe? Eliminating all of those variables, what's left is a potentially false reading from your test kit.
16 is definitely too high .. you're correct, NSW is somewhere around 8dKH.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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