Vacuums rarely die of old age. They lose suction, get labelled as worn out, and get replaced by a new machine that performs exactly like the old one did when its filter was clean. The filter is a consumable, and it is the only part in the airflow path that is designed to be thrown away.

Why suction drops before the filter looks dirty

A filter does not clog evenly on the surface. Fine dust embeds in the media, which raises resistance long before the outside looks grey. Airflow, not visual dirt, is what carries debris up the hose, so the machine can look fine and still be working at half its rated pull.

The three filters most vacuums have

  • Pre motor filter. Usually foam or felt, catches the bulk. Often washable, and the one that most affects suction.
  • Post motor or exhaust filter. Frequently a HEPA cartridge. Protects the air you breathe rather than the motor, and is almost never washable.
  • Bin or cyclone mesh. Not a filter as such, but the fine mesh loads with hair and needs clearing.

Robot vacuums

A robot that runs every day does far more filter cycles per month than an upright used at the weekend, and the units are small. Every two months is realistic with pets. Brushes and side brushes are on a similar clock, and a tangled brush roller costs more suction than a mildly dirty filter.

If the machine sounds higher pitched than it used to, it is usually breathing through a restriction, not asking to be replaced.

A diagnosis order that saves money

  1. Empty the bin to below the maximum line, because a full bin blocks the cyclone.
  2. Check the hose and the head for a blockage.
  3. Rinse or replace the pre motor filter and let it dry completely, at least 24 hours.
  4. Replace the post motor HEPA cartridge if it is more than six months old.
  5. Cut hair off the brush roller.

Four of those five are maintenance, not repair. Freshy tracks vacuum filters at six months and shortens that to four on heavy use, and you can add a robot vacuum as its own item, with a shorter custom cycle in Freshy Plus. See the complete schedule for the rest of the house.

Questions

How often should you replace a vacuum filter?

Six months normally, four with pets, two for a daily robot vacuum.

Why has my vacuum lost suction?

Usually a loaded filter or a blockage rather than the motor.

Can I wash a HEPA filter?

Only if the manufacturer says so. Most pleated HEPA cartridges are ruined by water.