I've had the need to do something similar for a slightly
different application. Go to the electrical supply/wire
section of your local hardware store and get a length of bare copper
grounding wire (heavy stuff about 3/16" in diameter). Run this
through your soaker hose and you can then bend it around to conform to any
shape you want. Think Gumby!
I would guess that the microbes
would also benefit from the trace amounts of copper that such a setup
would make available. In my five gallon setup, I have a copper elbow
fitting tied to a piece of string that I toss in the CT as it's brewing.
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