Hello i have a Maxi 310 beer cooler i have the python line is wired into an external thermostat. It controls cold water being pumped to a heat exchanger i have fitted to a beer fermenter.To increase cooling i have added salt to the water to lower the temperature. Looking at the parts inside the cooler most are stainless & plastic. But the freon coil is copper will the copper coil suffer corrosion damage from the saline solution. ❓ Cheers