PawExact

Problem guide · evidence separated

Screening and litter waste

A rotating litter box must separate clumps while returning usable litter. Particle size, shape, and clump integrity can change what passes through the screen.

Start here

Official boundaries related to this issue

These statements are included only when they directly concern the failure mode. They do not name every SKU shown below.

OfficialLitter-Robot 4
“Some silica gel litter beads and crystals can also be used with Litter-Robot, as long as they pass through the screen. However, translucent or white-colored litter (most often seen in crystal litter) may impact the litter level and Drawer Full Indicator (DFI) accuracy in Litter-Robot 4 and are therefore not recommended.”
Official source
OfficialLitter-Robot 4
“Alternative, plant-based litters typically do not work with Litter-Robot as these may not be filtered properly through the sifting system.”
Official source
OfficialLitter-Robot 4
“Litters that do not work in Litter-Robot are the strictly absorbent, non-clumping or loose-clumping litters, newspaper-based litters, and absorbent wood pellet litter.”
Official source
OfficialLitter-Robot 5
“Some silica gel litter beads and crystals can also be used with Litter-Robot, as long as they pass through the screen. However, translucent or white-colored litter (most often seen in crystal litter) may impact the litter level and Drawer Full Indicator (DFI) accuracy in Litter-Robot 5 and are therefore not recommended.”
Official source
OfficialLitter-Robot 5
“Alternative, plant-based litters typically do not work with Litter-Robot as these may not be filtered properly through the sifting system.”
Official source
OfficialLitter-Robot 5
“Litters that do not work in Litter-Robot are the strictly absorbent, non-clumping or loose-clumping litters, newspaper-based litters, and absorbent wood pellet litter.”
Official source
OfficialNeakasa M1
“Its filter sifts particles up to 3mm in diameter and 10mm in length.”
Official source
OfficialNeakasa M1
“The M1 automatic cat litter box is compatible with clumping or scoopable litter, but not with highly absorbent, non-clumping, loosely clumping, newspaper, or wood pellet types.”
Official source
OfficialPETSNOWY SNOW+
“Additionally, you can use certain silica gel litter beads and crystals with SNOW⁺ as long as they can pass through the screen.”
Official source
OfficialPETSNOWY SNOW+
“Litters that are not suitable for SNOW⁺ include those designed solely for absorption, non-clumping or those with loose clumping properties, newspaper-based options, and absorbent wood pellet litter.”
Official source

Use the signal carefully

Watch where clean litter goes during separation

The useful question is not whether the globe rotates. It is whether clumps separate while clean particles return through the screen.

  1. Check 1Inspect the waste drawer for visibly clean litter after early cycles and note the exact product and fill level.
  2. Check 2Distinguish particles that fail to pass the screen from weak clumps that break apart during rotation.
  3. Check 3Do not convert an unmeasured impression into a waste percentage; a useful report needs repeated observations or weighed material.

Observation language

Record the observation before naming the cause

Use concrete, repeatable descriptions. Each line below separates what can be seen from conditions that must stay separate and conclusions the observation cannot support.

  1. 01Transition carryover

    Discarded grains may belong to the previous bag

    Observable
    Dry particles in the drawer resemble an earlier formula after a litter change or mixture, while the current bed contains more than one visible particle type.
    Record separately
    Record the old and new complete SKU names, whether the bed was emptied, the mixing period, particle appearance, and which cycles produced the drawer material.
    Cannot infer
    A visually similar grain cannot establish its formula of origin or prove that the new product failed the screen; no clean-litter loss rate follows from a mixed drawer.
    Comparable when
    Interpret a new-formula observation only after carryover is cleared or explicitly documented and the same machine, fill, and inspection interval are preserved.
  2. 02Material state

    Dry clean particles reach the waste drawer

    Observable
    Drawer material looks unused, dry, and similar to litter still in the bed, without wet faces or clump residue.
    Record separately
    Record exact SKU, particle shape, fill level, machine model, and whether the material appeared after one cycle or accumulated across several.
    Cannot infer
    An unweighed handful does not establish a waste percentage, and one small particle does not describe the product’s full size distribution.
    Comparable when
    Compare repeated cycles with the same fill and formula before describing the observation as persistent clean-litter loss.
  3. 03Fragment state

    Wet or coated pieces enter the drawer

    Observable
    Discarded pieces have damp surfaces, torn edges, irregular clump shapes, or visible waste coating.
    Record separately
    Record clump formation, release, and breakage before counting these pieces together with dry unused litter.
    Cannot infer
    Wet fragments do not prove that clean particles failed the screen, even if both materials are present in the same drawer.
    Comparable when
    Sort and photograph material classes separately before changing delay, litter, or fill level.
  4. 04Return path

    Usable litter remains on the waste side

    Observable
    During separation, visibly clean material does not return to the bed and continues toward the drawer or bin.
    Record separately
    Keep screen fit, particle orientation, clump obstruction, machine cleanliness, and the exact model as distinct observations.
    Cannot infer
    The behavior cannot be transferred to another machine’s screen, and it does not identify a numeric particle threshold unless that model publishes one.
    Comparable when
    A useful comparison keeps the machine and product fixed and records whether the same return-path behavior repeats.
  5. 05Fill boundary

    Loss changes with the physical litter level

    Observable
    The amount or path of discarded material appears different after the bed is physically leveled or brought below the marked fill boundary.
    Record separately
    Record the physical bed against the machine mark separately from an app level reading and separately from product weight class.
    Cannot infer
    A change after leveling does not prove that fill was the only cause or that the exact product will screen correctly at every allowed level.
    Comparable when
    Do not change formula and fill together; preserve the first setup as the comparison baseline.

Continue by model or mechanism

Use the route that matches your observation

These links narrow a broad symptom into a machine-specific or mechanism-specific check. They do not turn a report into a universal fix.

Exact-pair signals

Reports that explicitly mention the issue

Absence from this list means “not recorded in the selected reports,” not “problem-free.”

Single reportWaste

Low Tracking & Dust Control

World's Best Cat Litter · Litter-Robot 4

An LR4 user reports that the large orange-bag Low Tracking pellets can pair up in the grate, miss the septum during cycling, and roll into the waste chute.

Original source
Original public text was readable when reviewed
Use mode
Standalone versus mixture not stated
Accessory
LitterHopper question context; accessory effect not isolated
Use duration
Unknown; qualitative wording is not converted to days
Open full context Original report
Single reportWaste

Really Great Cat Litter

Tuft + Paw · Litter-Robot 4

An LR4 owner reports that Really Great Cat Litter does not track for their long-haired cat, but above roughly 20% of the fill line its long particles do not fully pass the filtering gate and unused litter is dumped into the bin.

Original source
Original public text was readable when reviewed
Use mode
Standalone versus mixture not stated
Accessory
Unknown
Use duration
Unknown; qualitative wording is not converted to days
Open full context Original report
Single reportWaste

Original Health Monitoring Litter

PrettyLitter · Litter-Robot 4

After roughly four months the author said the original non-clumping PrettyLitter worked almost perfectly in LR4, but the app always read the litter as low; a 2026 update says the combination still works well.

Original source
Original public text was readable when reviewed
Use mode
Standalone versus mixture not stated
Accessory
Unknown
Use duration
1240 days
Open full context Original report

Known limit

What this page cannot prove

Public reports of litter waste do not provide standardized particle measurements or waste weights. Use maker limits as the boundary and treat reports as pair-specific warnings.