Cat Litter Sifter for Purobot Ultra: Cleaning and Care Tips
By PETKIT | Auto Litter Box, Smart Feeder, Water Fountain | Published: 2026-10-14
Category: Tips en onderhoud
Learn how to diagnose and fix common Purobot Ultra litter sifter problems, from sticky clumps to wear, so your automatic litter box stays clean and efficient.
Quick answer
If litter clumps stick to your Purobot Ultra sifter or it stops separating cleanly, first check that you are using the sifter type that matches your litter: the standard sifter for tofu litter or the honeycomb sifter for clay litter. Then clean the sifter regularly and replace it if you see cracks or permanent buildup. Most sifting issues are solved by using the right sifter and keeping it clean.
Match the sifter to your litter type
The Purobot Ultra uses a litter sifter to separate clumps from clean litter. PETKIT offers two versions: a standard sifter designed for tofu cat litter and a honeycomb sifter designed for clay cat litter. Using the wrong type can cause clumps to stick, tear, or fall back into the clean litter, forcing the box to work harder and leaving more mess. If you are unsure which litter you have, check the packaging or the texture: tofu litter is typically pellet-shaped and lighter, while clay litter is granular and heavier.
Clean the sifter regularly to prevent buildup
Even with the correct sifter, fine particles and moisture can accumulate over time, making clumps stick. Remove the sifter and rinse it with warm water—avoid harsh chemicals that could leave residue. For sticky residue, a soft brush or sponge can help. Let it dry completely before placing it back. How often you clean depends on use: in a single-cat home, a quick rinse every two to four weeks may suffice; multi-cat homes or those using clumping clay litter may need cleaning weekly. If you notice odor or visible buildup, clean it sooner.
Know when to replace the sifter
Sifters wear out. Look for cracks, broken tines, or areas where litter no longer separates cleanly even after cleaning. A damaged sifter can let clumps through, reducing the automatic litter box's efficiency and increasing odor. PETKIT offers a replacement Cat Litter Sifter (Only for Purobot Ultra) in both standard and honeycomb versions. If your sifter is more than six to twelve months old and showing wear, replacement is a simple fix.
Check the litter pad for related issues
Sometimes what looks like a sifter problem is actually a leak or tracking issue. The High Performance Cat Litter Pad Ultra 3.0 (Only for Purobot Ultra) is made of high-density 300D Oxford cloth with a waterproof coating. It resists sticking, scratching, and is easy to clean. The pad and cylinder work together to create a 360-degree leak-proof seal. If you see urine or litter escaping the box, inspect the pad for folds, damage, or misalignment before blaming the sifter.
Diagnose your sifter issue
- Symptom: Clumps stick to the sifter: Likely cause: Wrong sifter type for your litter, or buildup of residue. Check if you are using the standard sifter with tofu litter or the honeycomb sifter with clay litter. Clean the sifter thoroughly with warm water and a soft brush. If sticking continues after cleaning and verifying litter type, consider replacing the sifter.
- Symptom: Clumps fall back into clean litter: Likely cause: Damaged or worn sifter with enlarged gaps or broken tines. Inspect the sifter for cracks or deformation. If found, replace it. A new sifter restores proper separation and reduces litter waste.
- Symptom: Litter or urine leaking from the box: Likely cause: Misaligned or damaged litter pad, not the sifter. Check the High Performance Cat Litter Pad Ultra 3.0 for folds, tears, or incorrect installation. Ensure it forms a proper seal with the cylinder. If the pad is intact and correctly installed, then inspect the sifter for damage.
Product facts
- Cat Litter Sifter (Only for Purobot Ultra): The litter filter efficiently separates clumps from clean litter to help maintain cleanliness of the automatic litter box and maximum litter utilization. The standard litter sifter is suitable for tofu cat litter, while the honeycomb litter sifter is suitable for clay cat litter. Choosing the right sifter for your litter type prevents sticking and ensures efficient clump removal.
- High Performance Cat Litter Pad Ultra 3.0 (Only for Purobot Ultra): Made of high-density 300D Oxford cloth with waterproof coating, the high-performance cat litter pad embodies the excellent performance of anti-stick, scratch-resistant, and easy to clean. The pad and cylinder work together to achieve a 360-degree leak proof litter box. A quality pad reduces litter tracking and leaks, which can be mistaken for sifter problems.
- Purobot Ultra Automatic Litter Box: Purobot Ultra Automatic Litter Box monitors your cat’s urinary health with AI, tracking changes in litter-box behavior and recognizing each pet. It automatically cleans, auto-seals every trash bag, and refills a new one. Perfect for multi-cat homes, it delivers a hygienic and low-maintenance litter experience supported by a hands-free automated system. The sifter is a key part of this automated system; keeping it in good condition ensures the box can clean effectively and maintain hygiene.
