Accumulated material slows flow and changes sound or odor patterns.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Deterministic building intelligence
Follow the clues.
Follow the clues.
Reduce the uncertainty.
HouseSymptoms ranks likely causes from timing, location, weather and distinguishing evidence. The score is a transparent fit index—not a remote diagnosis.
21 diagnostic profiles31 failure fingerprints32 visual patterns
Active regional intelligenceGlobal baselineNo regional layer is active. Results use the global knowledge graph.
No terminology overrideSelect a regional pack to localize building language.
Open regional pack →Active profile
Gurgling drain or toilet
Separate partial blockage, vent obstruction and trap siphoning by which fixtures react and when.
Hear0evidence clues active
Transparent cause ranking
What currently fits—and why
Fit index compares this profile’s evidence. It is not a probability and does not prove a hidden condition.
Restricted venting changes pressure and drainage behavior.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Trap water evaporates or is siphoned away, removing the sewer-gas barrier.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Most useful missing evidenceSewer odor is presentA depleted trap allows odor entry.+
Wastewater reverses through a drain due to blockage, surcharge or system failure.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Other questions still available
How many fixtures are affected?
A local branch issue differs from a main or vent problem.
