I am trying to put together plans to make an Immersion Wort Chiller. A friend found 1/2" x 50' copper tubing for $38 at Lowes this weekend. I can't decide if I want to make it a 50' long double coile wort chiller like this one: http://www.homebrewtalk.com/f51/double-coil-immersion-chiller-209708/
Or a single coil that's 25' long and get my cost even lower and split the line with my friend who is also making one.
What are your thoughts and suggestion? I also saw that spliting the inner and outer coils for water source is a good idea to get colder water in both. Does the dual coil really make a huge difference in cooldown time?