Ions contribute to conductivity, polymers generally do not. Its a nonissue, you have copper, zinc, lead and possibly other metal ions dissolving from your block and radiator.
Question:
Since want to have probes in the water that are under an electric field, are you certain they will not react with the water? I once built a electrolosis device only to find that the copper leads had fully dissolved in a day (I was running 6 volts). The cell potiential of most metals with hydrogen is under a volt, so you may promote all sorts of fun reactions.
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