Frequently asked questions about Oskar little

It may be that your external hygrometer and Oskar little are measuring different values because the devices are located in different positions (heights) in the room. Different humidity is measured depending on the airflow and temperature. A tolerance of +/- 5 % is normal depending on the type of device. Oskar little optimally measures the humidity levels if he is positioned centrally in the room so that the room air can flow towards the sensor as freely as possible. If this is not possible, we would recommend positioning Oskar little on the wall with a clearance of at least 30 cm. Oskar little should never be “hidden” in the corner of the room or behind a sofa/piece of furniture as this may negatively affect the humidity measurement as well as humidification efficiency.

Yes, Oskar little switches back on automatically after the power supply is interrupted.

Set the output level at the highest setting. The size of the room, the height of the room (2.5 m) and whether the room doors are closed plays a role. If the room doors are open, the adjacent rooms are also included in the total area. With a lower relative humidity (less than 35 %), the humidity will not increase immediately. This is because the floors, furniture and walls are the first to absorb the humidity before it ends up in the air. It can take up to two weeks for everything to have absorbed sufficient humidity and for the level in the air to increase. As long as you have to refill the water tank regularly, your Oskar little is functioning properly. If the humidifier filter is more than two months old or if the upper part is hard and no longer soaked with water, it must be replaced.

Limescale deposits can form in the water base, which prevent proper operation.
We recommend that Oskar little be descaled regularly to ensure that he runs smoothly.

Yes, both filter versions can be used with Oskar little. We have recently updated the filter to a new version that works without the plastic frame. There are two reasons for this update: First, we were able to reduce the amount of waste by eliminating the plastic frame. The new filters are made out of textile- and plant-fibre. Second, the new material allows for a higher humidification performance.

For hygienic reasons and to ensure proper operation, we recommend the following cleaning intervals.
Attention: Never immerse the appliance in water (danger of short- circuit).

Daily: Fill the appliance with fresh, cold tap water. If the appliance is not used for several days, empty the water from the lower part beforehand and if necessary, clean it with a bit of dish detergent and a clean cloth. Fill fresh water into the lower part before putting the appliance back into operation.

Every 2 weeks: First remove the filters and the Water Cube™. Clean the inside of the lower part thoroughly every 2 weeks with a bit of dish detergent, warm water and a soft, clean cloth, sponge or brush. Then rinse the lower part thoroughly with cold water and put the filters and the Water Cube back in.

Approx. every 4 weeks (depending on the hardness of the water): First remove the filters and the Water Cube™. In the case of limescale deposits on the inside of the lower part, we recommend using the Stadler Form Cleaner & Descaler ( Alternatively, you can use a household decalcifier or vinegar. Then rinse the lower part thoroughly with cold water and put the filters and the Water Cube back in. For hygienic reasons, the filters must be replaced every 2–3 months.

Regularly as required: For external cleaning, rub with a damp cloth and then dry thoroughly.

At the end of the season: Before storing the appliance at the end of the season, clean it inside and out thoroughly and let it dry completely. Descale the lower part as described above. Clean the fan blades in the upper part with a damp cloth and then wipe them dry. Insert new humidifier filters and a new Water Cube in order for your appliance to be ready for the start of the next season.

In order to clean the inside, remove the humidifier filter and rinse out the water tank. Use a soft brush or a sponge to clean the tank thoroughly. Decalcify the water tank regularly depending on how hard your water it. Thoroughly rinse out the water tank after decalcifying and dry it before operating the air humidifier again. The following video shows the correct cleaning.

Used humidifier filters have to be disposed of with regular household waste.

For the hygienic and ideal operation of the air humidifier, the humidifier filter needs to be replaced every two months. If the filter is used for a longer period, the humidifying effect can be negatively impaired on the one hand and, on the other hand, the antibacterial action of the humidifier filter is no longer ensured. The humidifier filter can usually be obtained from where you purchased the unit.

During the evaporation process, the lime present in the water is collected in the filter cassette as limescale. The amount of lime present in your water will depend on the hardness of the water. The harder the water, the quicker the humidifier filter will also become hard and will have to be replaced. Note: If you don’t know the hardness of your tap water, you can ask your local water supplier. If you use water from a decalcification system which operates based on the principle of ion exchange for your Oskar little, salt may collect in the humidifier filter instead of limescale.

If the top part of the humidifier filter has become hard and it has been in use for less than 2 months, it can continue to be used in spite of this. Before you do so, you should remove the humidifier filter from your Oskar little, rinse it thoroughly with water, turn it over and put it back again – so that the part which had become hard is in the water. Note: It is possible that you may notice an odour after you have turned over the humidifier filter depending on how contaminated the filter is by constituents in the air or the water.

If the humidifier filter is more than two months old, replace it with a new one (see the question “How often do I need to replace the humidifier filter?”).

A mild yellow or brown discolouration of the filter material, mainly in the upper section, is normal. The residual water needs to be emptied if you do not use Oskar little for some time. If the humidifier filter is submerged in water for a longer period of time, without the fan being operated, algal growth may occur or mould may appear. To prevent this from happening, empty the device and allow the humidifier filter time to dry. Refill the water again if Oskar little is used regularly.

The substances in tap water or the air are the reason for the change in colour. The humidifier filter changes colour faster depending on the water quality. Although this does not look nice, it is harmless as long as it is not due to mould (a humidifier filter with mould on it should be disposed of and the appliance should be cleaned thoroughly).

If you haven’t used the humidifier filter for a long time, you can rinse it well, turn it over and continue using it. If the filter is older than two months, please exchange it for a new one (see “How often do I need to replace the humidifier filter?”). Important: The discolouration of the humidifier filter will not affect the performance of the air humidifier.

The causes of bad smell can be the water and air quality, a spent filter or a longer standstill of Oskar little with a full water container.

In any case, we recommend you to clean and descale the appliance thoroughly. If the filter has been in use for two months or longer, or in case it is completely hard due to water with a high content of limescale, replace the filter with a new one. If the filter has not been in use for long, you can rinse with cold and clean water thoroughly, turn it over and continue using it. If the humidifier filter is affected by mold, it must be disposed of and the device must be cleaned thoroughly.

Please read the instructions on the label on the inside of the upper part of Oskar little or watch the following video tutorial.

The picture shows the position of the Water Cube (previously Silver Cube) in the water base of Oskar little. Remove the upper part from the unit and then place the Water Cube in the designated position.

The appliance switches off automatically when the water container is empty. Oskar little will not be damaged when he runs out of water.

The intensity of the fragrance is influenced by various factors:

  • Type of fragrance (synthetic, natural, ingredients, etc.)
  • Room temperature and relative humidity (the more humid the air, the stronger the fragrance will be)
  • Room size (the smaller the room, the more intensive the fragrance)

In principle, you can increase the intensity of a fragrance by adding a little more fragrance oil. The strength of a fragrance will depend on the fragrance itself. Natural fragrances are often more discreet than synthetic ones and certain ingredients are more dominant than others.

It should also be remembered that first and foremost, the device is a humidifier. Its main focus is to provide humidity in the room and because of that, the intensity of its fragrance will never be as strong as the fragrance from an aroma diffuser.

Oskar little is an evaporator. During the evaporation process, the dry air is drawn in and routed through the moist humidifier filters. In the process, the air only absorbs as much water as it needs. This humidification system is inspired by nature. Oskar little emits the humidified air back into the room through the grill in the top part of the device. As the water is neither heated nor nebulised during evaporation, no water vapour or visible mist is produced

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Yes, your settings will be saved. If Oskar little is switched off and then on again or the top section is removed and then put back again, the most recent settings used will be applied.

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