Frequently Asked Questions


What timer should I choose?

The simple answer is.... most people like the 4 hr option. The longer answer requires another question.. 

"when and how do I plan to use the diffuser"

First, however a little about the timer and how it works. The 1, 4 and 8 hour timers turn on and off every 10 min for the total time specified. The 12 hr timer runs continuously for 12 hours and then shuts off. Our timers are set before we ship them. The timer system cant be changed by the user, so if you do get a diffuser and decide you want to switch timer options, its fine, we just need the base sent back to us and we can switch it for you. Timers are designed for you to be able to turn on the diffuser and walk away and forget it however even if you do run out of oil, while in use, it will not hurt the diffuser motor at all, its not like a car. 

When to pick the 1 hour unit

Targeted Use

  • This unit seems to be best suited for yoga studios and health professionals. You can turn the unit on at the beginning of the session and it will turn its self off around the end of a session. 
  • Very small rooms or apartments. 


  • People who need to be very stingy about how much oil they use (usually related to money) for use with very expensive oils like rose, neroli, sandalwood, and the likes, this may be the setting for you as you will not be using more oil than the exact amount you intended to use. 

When to pick the 4 hour unit

General use

      • If your like most of us and want to use the diffuser in your living room or general living area, most of the time the 4 hour unit works fine.  If you are modestly frugal, and not wanting to use hundreds of dollars of oils a month this is a good option.  Most people don't spend more than 4 hours a day in their house. Most of us get up, go to work, come home and turn on the diffuser for a few hours and go to bed.
      • Basically if your not sure, this is probably the best option for you. I will do well in almost all situations. 

When to pick the 8 hour unit


  • Some people like to sleep with the diffuser on and we have found that both 4 and 8 hours seem to work fine however, if you want the ability to run the diffuser for the entire night, 8 hours is best. You will need to add enough oil to the diffuser to last all 8 hours and you can get an idea of how much that will be here.  to be about the right amount of time for most people to use it. You can always switch it back on if you want it to run for another 4 hours, however that requires you wake up to do it. 

Extended use

      •  Sometimes people want the unit on all day, and plan to be around it all day. This is true when people are fighting colds, self medicating, or just love diffusing that much more.

When to pick the 12 continuous hour unit

Manual control

  • Some people just want the unit to stay on and want to control the amount of oil by means of reducing or increasing the oil output level. Its not very common to want this unless you have a special condition where you need that level of control. This is because if left on continuously on full power, you can go through a lot of oil very quickly 

External timer

  • Our diffuser can be couples with an external timer that will control the on/off cycles externally. Just turn the unit on to the power setting you desire and the external timer will turn the unit on and off by means of cutting power to the unit. 

Very large spaces

  • Sometimes the diffuser is placed in a larger space and the only way to fill that space with enough oil is to have it on constantly on full power. Many retail stores count in this category as the doors opening and closing and and constant A/C will require a lot more oil to fill the space.  

Self Medication

  • Some people treat them self with essential oil and need to "dose" in high volumes. The 12 hour unit is effectively gives you the highest possible output. 

When to pick the 1 hour unit

Targeted use

  • 1 hour timer seems to be best suited for yoga studios and health professionals. You can turn the unit on at the beginning of the session and it will turn its self off around the end of a session. 
  • Very small rooms, offices or apartments. 


  • People who need to be very stingy about how much oil they use (usually related to the cost of the oil) either if the user is financaially strapped or if the actual oils them-self are very expensive like Rose, Neroli, Sandalwood, and the likes. With the 1 hour setting,  you as you will not be using more oil than the exact amount you intended to use. 

One diffuser vs another

Product Information

My glass bottle broke, is there any way I can just replace that part?

Yes, you can buy a replacement glass bottle on our website for $18.99 each. You can also purchase a replacement glass top for $5.00 each. (These are both found under the "Parts & Accessories" section.)

Are there ANY plastic parts on your diffusers that essential oils will come in contact with?

No, there are absolutely no plastic parts on our diffusers that essential oils will come in contact with.

Are your diffusers covered under a warranty?

Yes, all of our service and support is done here in Boulder, Colorado. Our warranty lasts for one year, and includes full parts, replacement, and labor. After the one year warranty we still offer support and repairs, but there are fees associated with replacement parts. For example, a motor replacement is $10.00. It's a really simple device which is part of its beauty, so there is not much that can go wrong with it. We offer continued support for as long as you have your device. 

If I want to purchase several different glass bottle styles, will they all fit the same base?

Yes, all bottle styles will fit the same base. This allows the freedom to have several different glass bottle models if you wish, and use the same base.

How do I pick which style of diffuser? There are so many! Do they work differently?

All the units function exactly the same. It is suggested that you select which bottle type you would like, then the base shape, then the timer option. 

Use and Care

There seems to be a little oil left at the bottom of the diffuser that won't diffuse. What should I do?

Normally what I do if there is oil remaining at the bottom that is yellow or heavy, is to add some lavender. Lavender is incredibly light, blends with the other oils easily well and dilutes heavy oil enough to effectively vaporize. You can also just wash the bottle out with rubbing alcohol if you don't care to use it.

What's your experience with water based diffusers, what's the difference?

A simple summary, water units are mostly humidifiers that produce water vapor. The ArOmis unit only diffuses oil. Our unit is made of wood and glass, and most water units are plastic. This is mainly a concern because essential oils and plastics tend to be poor bedfellows. Oils stick to and corrode plastics and plastics tend to "change" the nature of essential oil through chemical reaction. Functionally a lot of people like water units because they like the puff of water vapor and flashing lights. I am much more of a fundamentalist with regard to therapeutic use of oils and tend to just want oils, not water or lights.  I think our unit is much prettier than the plastic ones and can be left in the main area of your house and look like a piece of art. The plastic ones seem to need to be hidden from sight.    

On a technical note, the water units, here is my experience so far.  I have really mixed feelings about that technology.They are 99% just a humidifier. The water droplets carry some oil for sure and look quite prolific but again its all water vapor. People claim that they can disburse oils but actually in my experience most of the actual oils, especially the heavy and sticky parts that we in the "therapeutic world" are interested in end up stuck or floating on the side of the water reservoir walls and make a sticky mess. What gets released are the light esters, not the oil.  

It makes sense actually when you think about it in terms of oil "size". Oil gets disbursed as micro-droplets in our ArOmis using direct air nebulization. Using simple common sense, what happens when you drop oil in water? It pools together into a big blob and floats away from pressure. This is what happens in the water units. The water/air droplets floating up off the ultrasonic transducer capture some oils that are located at the center of the water dish but most of the oil has already moved to the sides of the reservoir and are lost. So I see them as a inferior product for this reason.        

Functionally I also have found that most of the oil that is put into the water units gets stuck to the side of the reservoir bath and is not diffused. Especially the heavier parts (longer chain hydrocarbons and acids) of the oils. It is these longer chains often times that are the business end of the medicinal aspects of the oils. If these are not being released then the main point of the diffuser has been lost in my opinion.

How do I clean the diffuser?

The simple answer is .. with rubbing alcohol or with hot water. We have a video available that shows the entire cleaning process here 

How do I switch oils if I want a different scent?

You are free to change oils in the middle of diffusing. All you need to do is remove the cap and add any pure essential oil. You can add as many (pure) essential oils, as long as they're without a carrier oil. Note: There are a few oils that are really thick and need to be diluted with alcohol or other light oils.

Delivery Information

How fast will I receive my products and how?

We know you need your packages delivered promptly. That's why we ship all packages with USPS priority mail 2-3 day, free of charge for orders over $50 from within the United States. Normally this means that if you order Monday you will get your package by Thursday or sometimes earlier, depending on your distance from Colorado.  Expedited 2 day shipping is also available for an extra fee and normally goes out the same day of your order if ordered before 3pm.  All international USPS shipping options are available including international 1st Class Parcel Post and Priority Mail International. 

Billing and Account

Additional FAQs