Ten to fifteen for a standard 100 ml diffuser, twelve to eighteen for our 120 ml Stone Diffuser, and thirty or more for a large reservoir or an open-plan room. Start low and add,  the most common reason a fragrance seems faint is half the dose it needed.

About 35 fills from a 1 oz bottle, which is a couple of months for most people running a diffuser daily. The twin pack is roughly 70.

 If it holds water and makes a cool mist, yes,  any brand. Humidifiers too.

 We would not. Heat cooks a fine fragrance instead of lifting it, and the result does not smell like the fragrance you bought.

 No. These are fragrance compositions built by perfumers: top, heart and base, rather than a single distilled plant oil. That is why ten drops does what thirty drops of a single oil will not.

In the Aromatherapy Stone Diffuser, yes. Our cold-air diffusers take the Oil Diffuser Refill instead, and the A/C Scenting System takes the A/C Scent Refill.

Because most people end up with a diffuser in more than one place. Take the same fragrance twice and stop moving one bottle around, or take two and switch by room.

 Each is composed to stand alone, so we would run one at a time. If you want to alternate, the twin pack lets you take one of each.

It is cosmetic grade, vegan, cruelty free and formaldehyde free, diffused as a cool mist. Keep the bottle closed and out of reach, and give pets a way to leave the room.