Chiller
Before I bought my chiller I researched DIY methods. None of them proved suitable. I think you'll find that the beer fridge approach won't work and then you'll have a beer fridge with holes in it....
Do some digging online. Fridges are designed to cool static loads not dynamic. If you put a can of beer in the fridge, it gets colder and colder over a long time. The problem with tank water is that you keep pumping new warm water through all the time so the fridge never gets a long enough time to bring the temp down before new warm water is there.
Buy a proper chiller, you won't be dissapointed.
Garrick.
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