If your vacuum has lost suction, the filter is the first thing to check. A clogged filter restricts airflow, which reduces suction and makes the motor work harder and hotter. Cleaning it takes ten minutes and restores performance immediately.
But not all filters are washable, and washing the wrong one destroys it. This guide covers each type.
- Foam and felt filters: washable — rinse and air-dry 24 hours.
- HEPA filters: usually washable — rinse gently, dry fully.
- Paper or pleated filters: not washable — tap clean or replace.
- Never refit a damp filter — it grows mould and damages the motor.
- Frequency: wash monthly, replace every 6–12 months.
Filter types
| Filter type | Washable? | Cleaning method | Replace |
|---|---|---|---|
| Foam | Yes | Rinse under warm water | Every 6–12 months |
| Felt | Yes | Rinse and squeeze gently | Every 6–12 months |
| HEPA (washable) | Yes | Rinse gently, do not scrub | Every 6–12 months |
| HEPA (paper) | No | Tap outside or vacuum | Every 3–6 months |
| Cyclone mesh | Yes | Rinse and dry | Rarely |
Some HEPA filters are washable and some are not. Washing a non-washable HEPA filter destroys the fine fibres and lets dust straight through. If in doubt, tap it clean instead.
How to wash a filter
- Unplug the vacuum and remove the filter.
- Tap it over a bin to knock off loose dust first.
- Rinse under warm water from the clean side, so dust flushes out.
- Do not scrub — scrubbing damages the fibres.
- Squeeze gently if it is a foam filter, but do not wring.
- Shake off excess water and set it aside to dry.
Drying is critical
This is the step people get wrong. A damp filter grows mould, smells musty, and can damage the motor. Let the filter air-dry for a full 24 hours in a warm, ventilated spot — never in a dryer or with a hair dryer, which can warp it.
- Air-dry for 24 hours — longer in humid weather.
- Do not use heat to speed it up.
- Do not refit a damp filter — ever.
- Dry it flat so it keeps its shape.
- Keep a spare filter so you can use the vacuum while one dries.
- Check for smell before refitting — musty means it is not dry.
When to replace
Cleaning extends a filter's life, but not forever. Replace it when it is torn, permanently stained, or when suction stays weak after cleaning. Most manufacturers recommend a new filter every 6 to 12 months.
| Sign | Action |
|---|---|
| Torn or cracked | Replace now |
| Permanently grey or stained | Replace |
| Musty smell after drying | Replace |
| Suction still weak after cleaning | Replace |
| Over 12 months old | Replace |
Clean your vacuum filter monthly by rinsing it under warm water, and let it air-dry for a full 24 hours before refitting. Never refit a damp filter. Replace it every 6 to 12 months, or sooner if it is torn or stays clogged.
Frequently asked questions
Replacement filters
Keep a spare filter so you can use the vacuum while one dries.
