Roger & Stephen, There is a very great difference between making HVAC ARC with and without the CO2 blanket.
When using the CO2 blanket the conductivity is generally around 100 tp 300 uS/cc and the NO3 is 2 to 4 PPM. Without the CO2 the conductivity hits 850+ uS/cc and the NO3 will have an initial reading of 2 to 4 PPM, but after about 24 hours the NO3 jumps up by about a factor of 10 !! The above applies to a DW with an initial conductivity of 0.25 =/- .05 uS/cc. I ran a batch yesterday with a DW that had an inital conductivity of 4.0 uS/cc. The initial NO3 was 3.9 ppm and today is 2.9 ppm. With the low conductivity the anion must be ozone and that oxidizes the NO2 to NO3. The Higher cond. DW has unknow impurities in it so some other complex was formed. In reading the add for "Silver Spray 100" I noted that it is complexed with a citrate and potassium. "Ole Bob"
