Bruce I know you wanted to keep the water cool but if you wanted too keep a steady cool temp I know hot tub companies make in-line heaters that have a winter mode to keep above freezing and some have adjustable thermostats..
Interesting you should say that. I was just wondering if you could put a heater in line with the hose that's circulating the water. I'm almost thinking I dreamt this, but I'd swear that my old hot tub heated the water on friction. Is that weird?
Holding a redear sunfish is like running with scissors.
