Katie, when I was having peeing problems with both Storm and Starr,which were also behavioral, I bought a couple of bags of Dr. Elsey's Cat Attract Litter and I just poured some if it on top of my other litter. It worked out great. I also bought more litter boxes and put them close to the peeing areas. One was by my front door so I gradually moved the litter box to a new location. Now I'm using Dr. Elsey's Precious Cat Litter which is unscented and they all love it.

Here's a link to Dr. Elsey's booklet with coupons:http://www.fieldhaven.com/docs/libra..._solutions.pdf. He also makes a litter additive which might help you too. I've never used it though. Good luck.

Here's another good link that might help you:http://www.catinfo.org/litterbox.htm.