Hey I have a Koolance case and I know they tell you you should use thier watter and I do have some of it but I am not liking the yellow/green color of it and was wondering if I could just use distilled watter with an attative that adds not color because I would like to be able to add this UV blue dye I have to it to make it a spiffy color. What do you guys suggest would be the best addative to add that will prevent growth in my system without to much color added. Thanks guys!