Vacuuming Against the Flea Life Cycle: The Interval Below Which a Carpet Reservoir Collapses Without Insecticide

Most of a household flea infestation is not on the pet but in the carpet, as eggs, larvae and pupae. This study models that reservoir — 950 immature fleas in the stated stage shares — under vacuuming schedules with no insecticide, using stated per-pass removal fractions (eggs 0.60, larvae 0.45, pupae 0.08 plus a 6 percent vibration-triggered emergence) and daily development rates between stages. Daily vacuuming brings the reservoir below 5 percent of its starting size in 9 days and effectively to zero by day 28 (2.5 remaining). Every second day takes 20 days to the same mark; every third day, 36 days. Weekly vacuuming never reaches it: 234.8 fleas remain at day 28 and 70.2 at day 84, because development between sessions replaces what each session removes. Fortnightly vacuuming leaves 246.0 at day 84. The originated rule is daily vacuuming for the first fortnight of an infestation, then every second day until a month has passed — a schedule, not a chemical, is the intervention. This study is simulated, not measured. SIMULATED, NOT MEASURED.