600-800 is the peak value of TDS surge. Nominal is 200-400. It seems to climb much higher than the input water while it sits there idle. That's why it's really important to flush the membrane otherwise you are replacing the membranes more often which is costly.
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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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