You'd better break out the bleach -- if you don't, once you get your SWCG working again, you'll likely have ANOTHER problem to deal with -- algae!

BioGuard has made it difficult to get service info on their units -- typical of their 'customer oriented' approach to pool care, but I'll give you some relevant info, and then some links. I have no personal experience with the MS/Aquarite SWCG's so that's the most I can do.

1. Your unit is a re-branded Goldline (now Hayward) Aquarite, but may lack the self-cleaning feature.
2. This post has info about getting the Mineral Springs manual:
www.poolforum.com/pf2/showthread.php?14380
3. This post explains about the 'special' Mineral Springs salt:
http://www.poolforum.com/pf2/showthread.php?15052
4. And these posts has a bit of trouble-shooting info:
http://www.poolforum.com/pf2/showthread.php?15052
http://www.poolforum.com/pf2/showthread.php?12168
Good luck!