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My square foot of copper is outside the tank. Inside the tank was a copper probe for ground, but copper is an algaecide (I use copper sulfate to control algae in my pond). The next experiment I will not leave my hoses in the tanks (I used a pump to transfer water into and out of the tanks to watch the gauges), in case it was actually the rubber washing machine hoses that were involved. I’m encouraged if you haven’t had the issue with your rig and I’ll forge ahead.
I’ll post some results in the spring when I’m installed and running.
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