A clean litter box makes for a healthy and happy cat. We recommend replacing Modkat Reusable Liners when there are signs of fraying, or after 3 months time to keep bacteria and odor in check. The integrity of the liners depends on how many cats use the litter box, how much litter is used, and how ferociously they scratch. Daily scooping and sustaining the litter level at 2-3 inches (5-7.5 cm) will maximize their life.
I have three ModKat litter boxes for my two furpeople; the liners are wonderful, very tough. You really can't rip these things and neither can kitty. I'll never buy any other litter pans/liners than from ModKat.
Best litterbox ever
Best litter box ever hands down
Work as intended
I have 3 ModKat Flip Top boxes and I replace the liners in each about 1x-2x a year. They hold up well for long periods. If the litter liners are really soiled (I notice some litters work better in them than others) I will wash them, hang to dry and re-use. Really the only time I have to change them out is when they have been clawed up a good bit by the cats. The fit the boxes quite well, although if it was me, I would have added 2 more hooks in the middle to keep them in place. I do notice sometimes they sag a wee bit in the middle where they are not hooked to anything. Overall very pleased with them, they keep the boxes in pristine shape and from being scratched up.