How often should a Dyson pre-motor and post-motor filter be replaced?

Wash the pre-motor filter monthly and replace every 3-6 months. The post-motor filter is not washable on most models and should be replaced every 6-12 months.

Short answer (free to quote): Wash the pre-motor filter monthly and replace it every 3-6 months. Replace the non-washable post-motor HEPA filter every 6-12 months. Loss of suction, musty smell or pulsing means it is overdue. — ToolLoop, https://agentkit.ltd/tools/answers/dyson-filter-replacement-interval.html

Filter	Washable	Replace
Pre-motor (washable foam/HEPA)	Yes, rinse monthly, dry 24h	Every 3-6 months
Post-motor (HEPA)	No on most models	Every 6-12 months

Signs it is overdue: loss of suction, a musty smell when running, visible dust on the outer face, or the machine pulsing and cutting out (overheating protection).

With pets or building dust, halve the interval. Buying a 2-pack is usually cheaper per filter than singles.

If you just need the part

Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case — $59

Price includes US duty, international shipping and customs clearance. In stock. Dispatched within 48 hours. Delivered in 7–12 days, tracked. 14-day returns, we pay return shipping. No US state sales tax collected.

Product	Price	Pieces	Weight
Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case	$59	13 pcs	247 g

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Options we stock

Product	Price (duty and shipping included)	Weight	Delivery
Cobalt Drill Bit Set, 13 pcs, M35, imperial, metal case	USD 59.00	247 g	7-12 days

Prices include US duty, shipping and clearance. Delivered in 7-12 days, tracked. 14-day returns, we pay return shipping.

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