My Dad had a Littermaid when they first came out over 7 years ago. I was not impressed with it at all. The waste container was very small and filled up fast, you can only put a small amount of litter in it or the rake won't sift. For cats who like to dig to China, this is not good. They may have improved it over the years, I don't know.

I want to try the rolling litterbox. But I can't find the super huge one they sell. With the regular one there's not much room for the cat.

When I said put salt in the cats water, I meant a tiny pinch. I doubt that would harm them.

As far as cordless fountains, the only ones I've seen are plastic. I had one for a couple of year. You will the reservoir and then put the well on top. Flip it over and the water trickles down. It only fills up when the water level gets low. They're okay but I couldn't use it anymore because my cats were getting kitty acne from the plastic.