You can use a combination of THIS andTHIS with distilled water to prevent corrosion.
Without a pump relay switch you would have to cut a small hole in the back of your case for the pump power cord. The downside to a pump relay switch is that you have wire it with the main power supply. I don't know how to do this myself, here is a guide.
http://www.procooling.com/articles/h...umps_-_p.shtml
