Just thought I'd add an update for any interested.

It's a year later now. I did everything, more litterboxes, different litterboxes, different litterbox locations, new urine remover, different litter, and TONS of urinalysis tests on all 7 of the cats.

6 of the cats have problems with urinary crystals and occasional infections, the solution has been to put those cats on Hills C/D food, and do a urinalysis occasionally to check for infections, and treat with antibiotics those with infections.

The peeing slowed down but didn't stop. I mean I had pee on my fridge, my stove, my counters, my microwave, the walls, two sections of my sectional were trashed.

This all despite cleaning the litterboxes 5-6 times a day, and constantly putting cats in the box anytime they sniffed anything, and using generous amounts of Nature's Miracle. I was having panic attacks over it and had to take tranquilizers.

When I finally reached the point I could do nothing else I took my most suspected pee-er to work with me (Cami) and she had to live in a cage for 2 weeks.

Aside from finding some old pee spots we went those whole 2 weeks with no pee! That verified that she was my only active pee-er. And she used her box in her cage 100% of the time.

I brought Cami home after 2 weeks and put her in my spare room to see if having her noises and scent in the house would cause any peeing, or if her smelling/hearing the other cats would cause peeing.

So far it's been about 6 weeks and no pee outside the litterbox (despite Sassy having a UTI that we had to treat).

I hate having Cami shut up in a separate room, she's so lonely not being out in the main house where the activity is, but apparently she just plain doesn't get along with the male cats, particularly Bear.

I tried letting her out once and following her around constantly. It lasted about 20 minutes. The whole time she went from one spot to another that had been peed on in the past to sniff. In one area I stopped her from spraying (or at least it looked like she was going to.) The entire time she was out, Bear followed (rather stalked) her and she did not purr or seem happy until I put her back in her room again, at which point she started purring and being lovey again. I spend several blocks of time with her every day petting and playing with her and I think she sort of enjoys having my complete attention.

Sometimes certain cats just plain don't get along no matter what you do.

Now the question is, does she have to live in the spare room until Bear passes away (8-10 years) or can she be re-integrated into the house?

At this point I'm not rushing anything for fear of the peeing starting up again.