I need some type of heat exchanger for my DIY chiller. I plan to use an old water fountain chiller hooked up with a small inline pump that pumps chilled water through 1/4 inch tubing into the sump - recirculating. With this design in mind, I need the sump-heat exchanger material. Cannot be copper tubing... could be SS right? But if I am going to do it, I wish to do it correctly, so where might I get some 1/4 titanium tubing? maybe 3 - 4 feet of it?