You might find Flagyl will work to help clear this up or a big change in food to one that is easily digested.
Pale diarrhea may indicate a problem with pancreatic enzymes or gall bladder.
Read here about inflammatory bowel disease
http://www.marvistavet.com/html/inflammatory_bowel_disease.html
For a food change you might try California Natural Cat, Blue Buffalo Cat, Chicken Soup for the Cat, Natural Choice or Wellness alternative diets with rabbit or duck or venison.
One of those might work for you.
But if its an intestinal parasite or a pancreatic or gall bladder disorder you will need vet help.
Hope this helps you!
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