To maximize tray life: Add extra Blue Crystal litter to top off the tray every 1-2 weeks. This compensates for what sifts out with waste. Keep the privacy hood closed when not in use. Open access leads to excess digging and litter kicking. Remove large stools that won't breakdown between rakings. This prevents waste buildup. Use the health counter lights to promptly replace the tray when needed. Consider adding an extra backup tray if you have multiple cats. Rotate in a fresh tray as soon as one gets full. Following the above tips can help extend the time between litter tray swaps and get the most from your ScoopFree investment.