unfortunately with as much cat litter as I go through, I have to keep my choice cost effecient. I will not use covered litter boxes because I do use cat litter that has dust. Around here each evening litter boxes are gathered up, dumped, sprayed with bleach cleaner, rinsed, then only enough litter to cover the bottom of the tray. This keeps the litterboxes clean especially when I have foster cats here too, but I do go through alot of cat litter.
I tried to use the pine cat litter, but Spirit absolutely refuse to use it, she will start going around the house instead.