I use Dr. Elsey's Ultra Precious Cats. It's unscented and 99% dust free. It's small granules. He also has a litter (or additive you can use) called Cat Attract to attract cats to the litter box. It smells like catnip to me. We've had litter box issues here. I use 1 more box than cats, keep groups of boxes in 2 private, noise-free spots in the house (always accessible). Keep varying depths of litter (some like it deep and others do not). Scoop 3 times a day and dump entirely each box once a week and wash it. I use the high back uncovered boxes from Drs. Foster and Smith(currently on sale).
I love Pam Johnson-Bennet's book, Think Like a Cat. She mentions that we might not like to stand in an toilet with waste already in it! Article by her: http://www.catchannel.com/cat/experts/pam_johnson_bennett/article_PamJB0012.aspx My cats don't like covered boxes (they really hold the odor and restrict movement). Also, it is recommended you have boxes on each floor of your house. Some cats (my Winston) guard the box so others (my Lucy) find other places to "go"....some cats urinate to comfort themselves (if you've had strangers in the house). There are so many quirks.... www.catinfo.org has lots of litter box info. Written by a vet. Another great site re litter box info: www.catnutrition.org ~ another great site Also, http://www.belovedanimals.com/information/library/ca7.html (ignore the suggestion about Alpine cleaners ~ they cause respiratory problems).... If I can remember to "think like a cat" I can usually (not always) figure out why mine are doing something I'd prefer they didn't! Laurie