you mean filter out bad stuff? or like so the water and ice cools it? If it goes through just ice it'll wanna be cold as the ice, but if it goes through water it will wanna be as cold as water, 'n I think ice water is what most people use, as opposed to my idea of using pure ice.

oh yeah my friend is gonna freeze salt water because it freezes at a lower temp 'n we'll be experimenting with that...holy shit I am "experimenting" with pot!