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Dehumidifiers 除湿剤(じょしつざい)

On Apr 29th, 2019


1. What exactly are these dehumidifiers?

These small dehumidifiers contain a special polymer or other chemical, such as calcium chloride, that absorbs water in the air. When the material absorbs the water, it melts and drips down into the bottom compartment. When all of the material is gone from the top compartment, it is type to dispose of the liquid inside.

Some types have easy open tops for disposal, some cheaper kinds require you to cut open the top for disposal. If your dehumidifier has a seal that says 水捨てシール, simply peel back the seal and poor the liquid down the drain or toilet. Make sure to run water or flush to clear it out of your pipes.

Be sure not to touch the liquid as you dispose of it. If you do happen to get it on your skin, make sure to wash your hands afterward.

2. Where can I buy these dehumidifiers?

These dehumidifiers can be purchased at any drug store and at some grocery stores.

3. How to throw away

Peel off the sticker and dump it!


When the dehumidifier becomes full, you must dispose of the liquid inside. If you do no, it will turn to rust. Open the top of the container by either using scissors to cut it open or by peeling up the designated seal. Then, pour the liquid down the drain with the water running, or flush down the toilet. Be sure to thoroughly rinse the scissors you used to cut open the white covering.

Don’t pour the liquid into plants, as this will kill them.

Be sure to put the empty container into the proper garbage.

4. Other types of dehumidifiers in Japan

Activated Charcoal Type

- This type of dehumidifier removes extra water from the air and also deodorizes.


Packet Type

- These are perfect for small spaces or areas where clothing is kept. You need to only remove a packet from its protective plastic and put it where you need it.


5. Other information and precautions

  • When the temperature or humidity levels are low, this may cause the material in the top compartment of the dehumidifier to become hard. This is perfectly normal and the material will begin to melt when the humidity rises again.

  • If the liquid inside the dehumidifier comes into contact with wood, leather, or metal, it may cause staining or rust. If this contact occurs, wash the item thoroughly with clean water.

  • If the liquid inside the dehumidifier comes into contact with skin or eyes, rinse thoroughly with water. If ingested, drink a large amount of water and contact your doctor.

6. Tank type precautions

  • Do not remove the white sheet on top of the container. This keeps the material in the top portion of the tank inside. If this sheet becomes damaged and the contents comes out, please discard the material and tank. Be sure to wash your hands afterwards.

  • Don’t let any substances such as detergent, oil, or alcohol come into contact with the protective white sheet on top of the container.

  • After removing the clear film to activate the dehumidifier, do not puncture or damage the white sheet covering the container.

7. Packet type precautions

  • Do not tear or damage the packet, or remove the material inside.

  • Putting pressure on the packet may cause it to break.