This box has been such a pain and waste of time and money. Between the box and the refills, it was almost $300 invested. I didn't expect it to last as long as a month as advertised as I have multiple cats, but I expected at least a week before needing maintenance. At this point I'm lucky to get 3 days out of a tray. Ive since gotten a cleanable tray (another $70) and switched to non clumping clay to save some money, but the maintenance is just as involved as scooping. Solids will get stuck behind the fence and need occasional cleaning so that it can actually rake the litter properly.