Air Fresheners and Scent Refills: Diffusers and Oils

Reed, plug-in or ultrasonic diffuser

Reed diffusers need no power: rattan sticks draw scented oil up from a bottle, and the more sticks you use, the stronger the scent. Electric plug-in diffusers warm or fan out a refill and cover a room evenly, but each refill fits only the unit made for it. Ultrasonic diffusers vibrate water mixed with a few drops of oil into a fine mist, so they add a little moisture to the air and need regular cleaning. Pick by room size and by how much noise, upkeep and wiring you will accept.

Essential oil, fragrance oil or refill

An essential oil is distilled or pressed from a plant; labels such as 'pure essential oil' on a 30 ml bottle of lavender, peppermint or eucalyptus describe that. A fragrance oil is a blend made for scent, not for aromatherapy claims. Neither should be applied undiluted to skin, swallowed, or left within reach of children. Many oils are harmful to pets, particularly cats, so ventilate and ask a vet before diffusing around animals. Air-freshener refills and gels are sold per dispenser, so match the model before buying.

Questions about Air Fresheners and Scent Refills: Diffusers and Oils

Are essential oils safe around pets?

Not always. Cats are especially sensitive, and oils such as tea tree can harm dogs too. Keep diffusers where pets can leave the room, never put oils on animals, and check with a vet first.

How many drops of oil go in an ultrasonic diffuser?

Follow the maker's instructions; most units call for roughly three to ten drops per 100 ml of water. More drops give a harsher smell, not better results, and can leave residue on the tank.

How long does a reed diffuser last?

Typically several weeks to a few months, depending on room warmth, airflow and the volume of oil. Flip the reeds now and then to refresh the scent, and keep the bottle away from direct sun.