Pristine Blue is copper. You still need to maintain a .5ppm free chlorine level with it for proper sanitation of the water. Here is a post you should read:
http://www.poolforum.com/pf2/showthread.php?t=98
Ben, the moderator of this forum, discusses copper and mentions Pristine Blue in the post. I believe once you read it you wil convert your biguinide pool to chlorine and have healthy water, save a lot of money, and have fun in the process!

There is a lot of good info to be had here and a lot of very good advice. If you get into a sticky situtuation the great folk who frequent this forum will go out of their way to walk you through it.
I hope I have said enough to convince you to try the 3 B's -- Bleach, Borax, and Baking Soda!