The complete guide
Using aromatherapy sponges in an air purifier without overdoing it
Most people who buy their first air purifier are solving one problem, usually dust, pollen, or a smell that won't quit, and they end up with a machine that only does that one thing. A diffuser goes on a different shelf, plugged into a different socket, and the two never talk to each other. The AIRTOK AP0601 is built to close that gap: one unit, one plug, that filters the air properly and lets you scent it if you want to. This guide is about the part most reviews skip, which is how to actually use the aromatherapy sponges well rather than just knowing they exist.
What the sponges are actually for
Inside the AP0601's housing sit twelve small sponge pads, positioned so the same airflow that pulls dusty air through the HEPA H13 filter also passes over them on the way out. Add a few drops of essential oil to a sponge and the scent rides that airflow into the room. It isn't a separate fan or a heated diffuser plate; it's passive, which means the scent is subtler than a dedicated diffuser and refreshes as the purifier runs rather than blasting out in one go.
That subtlety is the whole point. A purifier that also blasted out heavy fragrance would be working against itself, since strong synthetic scents are exactly the kind of airborne particle some people are trying to filter out in the first place. The AP0601's approach is closer to a light background note than a room spray.
How much oil is too much
The instinct with any diffuser pad is to soak it, and that's the mistake to avoid here. A few drops per sponge, refreshed every few days depending on how often the unit runs, is enough to notice without the aromatherapy sponges leaving oily residue that then travels toward the fan motor and vents. If a room smells overwhelming rather than pleasant within a few minutes of switching it on, that's the signal to use less next time, not more.
It's also worth being deliberate about which oil goes in. Lavender or chamomile for a bedroom aiming at wind-down, citrus or eucalyptus for a home office where you want something brighter, and nothing at all if the purifier's job in that room is purely allergy control. There's no rule that every use needs a scent; the HEPA filtration runs exactly the same with or without oil on the sponges.
Safety around pets, kids and sensitive noses
Essential oils aren't universally safe for every household. Some, notably tea tree and certain citrus oils, can be a problem for cats specifically, and strong fragrance in a small bedroom isn't ideal for babies or anyone with a genuine scent sensitivity. If the room houses a pet, a nursery or someone with respiratory sensitivities, either skip the aromatherapy sponges entirely and run the unit as a plain filter, or choose a mild, well-diluted oil and keep the room ventilated. The AP0601's lock function is handy here too: it stops the settings, including anything tied to the sponge airflow, being knocked about by a curious pet or child.
Keeping the sponges from working against the filter
The sponges sit near the airflow but not inside the HEPA stage itself, so oil residue shouldn't reach the filter under normal, moderate use. Still, replacing the sponges periodically (rather than topping the same ones up indefinitely) and sticking to the recommended filter replacement schedule of every 3 to 4 months keeps both systems performing as designed. A filter that's overdue for replacement will struggle regardless of what's happening with the scent, so don't let the more interesting feature distract from the basic maintenance.
Getting the timing right
Because the diffusion is airflow-driven rather than heat-driven, it responds to fan speed. Running on the lowest, sleep-mode speed gives a gentler, slower release, suited to an evening wind-down over a couple of hours. A higher speed moves more air and scent more quickly, useful if you want a change noticeable within minutes, say before guests arrive, but it will also use up the oil on the sponge faster. Pairing a higher speed with the 2 or 4 hour timer, rather than leaving it running all evening, tends to give the best balance between a noticeable scent and not overdoing it.
The short version
Use the sponges lightly, a few drops at a time, and treat scent as optional rather than the main job of the machine. Choose oils that suit the room, skip them altogether around pets or babies unless you're confident the oil is safe, and don't let the aromatherapy feature distract from the basic filter-replacement schedule that keeps the HEPA stage doing its actual work. Done that way, the AP0601 earns its two-in-one billing instead of just being a diffuser that happens to also filter air.