Automatic Litterbox Central

I am using a Litterfree box for my 6 cats, and transitioning from Littermaid boxes. I plan to order another Litterfree soon. While it works well, it could use some changes:

1. The plastic granules need to be made smaller - I suspect my cats don't like the way they feel on their feet.

2. The dryer needs to have additional vents on the sides of the vertical processing unit - not all of the granules get dry.

3. In response to the water usage question, I measure it at about 1.5 gallons per full cycle. Not a big deal.

My cats use the Litterfree, but still seem to prefer the boxes with traditional litter.