Sifter doesn't well distribute cat litter

Last updated: October 31, 2026
Applicable model: Popur S7 Split Litter System (SLS)
Applicable firmware version: 4.5.0 & onwards
Applicable mobile app version: 2.2.0 & onwards (both Android & iOS)

πŸ” Technical Clarification

We'll finally offer our own litter soon, after years of searching and testing. It's plant-based, mixed with different types of litter granules, and works well with all three sifters without using the Chunky-litter mode.

Since firmware 4.5.0 and app 2.2.0, the Chunky-litter mode has been updated and redesigned, which is able to work flawlessly with almost all kinds of cat litter of various granule sizes and shapes. It helps address the failure to sift coarse litter particles, as well as the issue of uneven litter bed after smoothing.

Once the NEW Chunky-litter mode is activated, the sifter will always be strengthened during the smoothing process, regardless of the choice of repeat options. Below is a more detailed clarification on the available repeat settings.

No repeat

The only change in behavior is that the sift will be strengthened.

Recommended for soft shreds, sawdust, shavings, flakes. Some popular brands or formulae are: TBC

Sift only

The litter tray will oscillate at least twice during the initial tilt & sift process. More oscillations be required for large granules like 3mm cylindrical tofu pellets, or the 6mm sifter. To increase the number of oscillations, use the Soft-stool mode or Reshuffle clumps function together with the Chunky-litter mode.

Popur S7 App β†’ Device Page β†’ Modes menu β†’ Soft-stool

Popur S7 App β†’ Device Page β†’ Top-right icon for Settings β†’ Spin β†’ Reshuffle clumps

For hard beads, crushed pebbles, irregular shapes. Some popular brands or formulae are: TBC

Smooth only

The litter tray will oscillate each time during the subsequent return & smooth process. The number of smoothing action is always determined by the Smooth function. Higher amount of cat litter typically requires higher number of smoothing.

Popur S7 App β†’ Device Page β†’ Top-right icon for Settings β†’ Smooth

For 2mm bar-shaped, cylindrical pellets. Some popular brands or formulae are: TBC

Both Sift & Smooth

It's a combination of the Sift only and Smooth only options explained above.

For larger pellets or granules. Some popular brands or formulae are: TBC