PawExact

LR5 screening diagnostic

Why is clean litter going into the Litter-Robot 5 waste drawer?

Clean litter in the LR5 drawer can point to screen fit, loose clumps, or a material outside the preferred class; identify the discarded material before changing settings.

Decision rail

Four checks, in order

Passing one check does not override a failure or unknown in the next. This is a compatibility decision, not a popularity ranking.

  1. 01Identify

    Inspect what reached the drawer

    Dry, intact particles and wet or broken clump pieces are different observations and should not be recorded as one waste result.

  2. 02Boundary

    Apply the LR5 material rule

    Standard-weight clumping clay is preferred; plant filtering, crystal screen fit, and non-clumping exclusions remain separate gates.

  3. 03Repeat

    Watch several unchanged cycles

    Keep the exact formula, fill level, cycle delay, cleaning state, and household load stable before attributing a pattern to litter.

  4. 04Evidence

    Keep the conclusion provisional

    Without an accepted exact LR5 report or measured waste, the diagnosis is an observation path, not a product failure rate.

Published boundary

What Litter-Robot 5 actually says

These statements describe classes and limits. They are not PawExact tests and do not automatically approve every product using the same marketing term.

OfficialLitter-Robot 5
“We recommend a high-quality, standard-weight, clay-based clumping 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

Official boundary review

What the source supports—and where to stop

An LR5 waste-drawer diagnosis that separates dry unused grains, damp clump fragments, and a possible level-reading discrepancy. Editorial review completed 2026-10-02; official source last verified 2026-10-02. This is not a PawExact test.

Direct wording
LR5 names screen and material limits, not a loss rateThe LR5 page conditions silica beads and crystals on screen pass-through, warns that plant alternatives may not filter properly, prefers standard-weight clumping clay, and excludes non-clumping, newspaper, and absorbent wood-pellet constructions. Its light-litter warning says those colors are not recommended because readings may be affected; it does not measure physical waste.
How it applies
Classify the waste before interpreting the screenDry intact unused grains in the drawer raise a return-path question. Wet, coated, or irregular pieces raise a formation or breakage question. Photograph the physical drawer and litter bed before comparing app readings; a sensor mismatch and actual clean-particle loss are different observations.
Exact-product record
No accepted LR5 drawer observation is attachedThe selected clay, plant, crystal, and paper cards have no accepted exact-SKU LR5 use reports. The one A-level Purina Designed for Litter-Robot relationship elsewhere in the LR5 matrix is an official product claim, not measured drawer loss or a PawExact test.
Stop condition
Stop before calculating or attributing lossDo not call damp fragments clean unused litter or assign a percentage without measured starting and discarded amounts. If exact formula, fill, cycle settings, cleaning state, repeated observations, or physical versus displayed drawer status is unknown, the page supports a diagnostic path rather than a product failure rate.
Review the recorded official source

Exact-product records

Products that show why the class label is not enough

These products illustrate preferred, plant-based, crystal, and non-clumping constructions under LR5 rules. PawExact has no accepted exact-product LR5 report, so every card remains a class-rule estimate.

EstimatedClass rule only

Ultra Unscented Clumping Clay

Dr. Elsey's

Material
Clay
Clumping
Clumping
Weight
Standard

Recorded attributes match the preferred class, but LR4 reports do not prove LR5 screening behavior.

Likely compatible

Read exact record
EstimatedClass rule only

Low Tracking & Dust Control

World's Best Cat Litter

Material
Corn
Clumping
Clumping
Weight
Lightweight

Its plant material falls under LR5’s filtering warning; the existing clean-litter-loss report is tied to LR4, not LR5.

Not recommended

Read exact record
EstimatedClass rule only

Original Health Monitoring Litter

PrettyLitter

Material
Silica Crystal
Clumping
Non Clumping
Weight
Lightweight

Crystal particles still need to return through the LR5 screen, while non-clumping behavior remains a separate limitation.

Compatible with conditions

Read exact record
EstimatedClass rule only

Recycled Paper Crumble

Fresh News

Material
Paper
Clumping
Non Clumping
Weight
Lightweight

Paper and non-clumping construction sit outside the published LR5 boundary rather than representing a settings problem.

Not recommended

Read exact record

Before a larger purchase

A small, observable first-use check

This is not a controlled test protocol. It is a way to notice an obvious mismatch before treating one successful cycle as proof.

  1. Check 1Photograph the drawer contents before mixing them with older waste, and label dry clean particles separately from wet fragments.
  2. Check 2Confirm the full product name, material, clumping behavior, weight class, and current package rather than relying on the brand name.
  3. Check 3Keep the bed at the maker’s normal fill boundary and record cycle delay, cleaning state, cats, and repeated cycle count.
  4. Check 4If unused particles repeatedly enter the drawer, compare their size and form with the material-specific screen warning before changing unrelated settings.

Known limits

What the current evidence cannot prove

  • PawExact has not measured LR5 screen openings, particle distributions, clump strength, or discarded mass for these products.
  • There is no accepted exact-product LR5 public report in the current evidence set.
  • Drawer contents alone cannot establish whether litter, fill, moisture, cleaning, or another machine condition caused the result.