Just finished building a typical copper immersion wort chiller. I tested it and it works fine, but I was wondering if the flow rate was important. When I hook it up to the water tap, the flow is fast. When I use the 158gpm pond pump, the flow is steady, but not as fast. I was going to use the pond pump to pump ice water through the chiller, as the tap water is probably not all that cold at this point. Any thoughts?