Can't you simply unplug this connection and install a proper earth at your place? That's what I did (literally: huge copper bar buried) and a lot of stuff (including the shower, which in my country is electrically heated) stopped giving me tingles.
A few US soldiers in Iraq were wounded in showers because while the electrical system was not properly ground, the shower drains were.
And the salt would reduce evaporation (and remain until it rains) until next time.
Would probably kill any crops, which will help retain even more moisture.
My fences appear to provide maximum output (on a standard livestock electric fence tester) with our regular well water, so it hadn't occurred to me to give this any further thought.
https://www.newark.com/pdfs/techarticles/megger/Tech_Tips.pd... (top-right).
Over time, whatever ions are in the soil will get washed away, so you need to keep re-adding, even if you started off with ion rich soil (e.g. from backfilling).
Back when Radio Shack was closing I put the damper on some guy who was going to buy all the grounding rods thinking he'd scrap the copper. I did him the favor of disappointing him before he spent his money.