Are you measuring at the exit of stage 1 or stage 2? I just measured both mine and there was quite a difference, 10 after stage 1 and 22 after stage 2. I'm not sure if that means my second stage is producing nitrate, or whether the first stage started reducing more and the water simply hasn't passed all the way through the second stage yet. At any rate I changed my feed situation around again so I'll see if I can get to your kinds of results.
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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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