I had this exact same problem. On brew days I would connect to the cold water hose under my sink and it worked like a charm. I ran my hose through the kitchen window so that I could have my brew water outside and I still had hot water in the kitchen sink. The only downside was the low flow rate...
I recently moved to FL and found a really easy solution. I took an old IWC of mine and submerged it in a cooler of ice water in series with my good IWC. I was able to reduce the ground water from 83.5 F to 75 at whatever flow rate I get from my garden hose. My old IWC was just 20' of 3/8"...
I got metallic flavors once because I used a Brillo pad to clean my aluminum kettle. It gave it a nice shine but was way to abrasive. Switched to a gentle go-over with a sponge and haven't had a problem since. Appley flavors will go away after some condition time.
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