Clevercat Litterbox & Liner Instructions: Install Clevercat liner and add 2" to 3" of litter. Put cat inside uncovered litterbox. Use without lid until cat has eliminated several times. Begin to use lid. Tip: Smooth liner against bottom and sidewalls to release trapped air before and after adding litter to maximize interior space for cat. Recommended Litterbox Maintenance: Remove solid waste daily for cat's best health. Replace liner and litter every 5 to 7 days. Tie double-knot at top of liner for disposal. Please dispose of properly. Wash litter box as needed with mild soap water. Use brush to clean tracking mat. Warning: Keep plastic liners away from babies and children as suffocation can occur. Extruded in the USA.