I currently use Arm & Hammer Essentials natural clumping litter. I like that its bio-degradable. Worked well for two cats, doesn't work well at all for three. Doesn't clump as well as some other brands I've tried. I scoop the box twice a day. Litter Maid box or similiar is not an option. Oldest cat is a former feral that is easily spooked. Would be a disaster if she decided to stop using the box. So recommendations? Edited because grammar is not my forte' at present.