Home made copper chiller oxidation

I am in the process of building a fermentation temperature controller (in the same spirit as the grainfather glycol chiller), the process is mostly done and I am testing the system with water.

The heat exchange is made through a hand-bent copper tubing plunged in the fermentation vessel; the problem is, after a day or two, the water inside the vessel takes a light yellow tint and there is a rust spot at the bottom of the vessel (the chiller touches it).

So my questions are, will this affect the beer? Is there a way to prevent it? I am thinking the yeast will eat the oxygen, preventing oxidation but will it be enough? worst case scenario I'll buy an inox chiller but its a bit against the DIY spirit :)

Thank you for your time!

Topic wort-chiller diy copper fermentation homebrew

Category Mac

1
answered at

First this: How to Brew: Brewing Metallurgy

Apparently, there should be no problem in using a copper chiller in your fermenting beer. Make sure there is no oxidation before you use your cooler.

1
answered at

How clean is your copper coil? If it were me, I'd be going straight for stainless, to be honest. If you want to go the DIY copper route, keep the copper outside the fermenter by wrapping it around the outside, a sort of DIY jacket, if you will.

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