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Clean Air Optima Humidifier CA-604B Smart Top Filling
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Brand
Clean Air Optima
Colour
black
Connectivity
WiFi, Bluetooth
Container Volume
3800 ml
Dimensions
210 x 215 x 290 mm
Miscellaneous
App control
Note
Through the process of refurbishing the IPxx certification can no longer be guaranteed and, for example, water damage is therefore excluded from the warranty conditions.
Power
30 Watts
Weight
2800.0 g

Your refurbed product

Refurbed products are more sustainable and up to 40% cheaper compared to a new device. Your trusted refurbed product comes with a minimum 12-month warranty and a 30-day free returns policy, with no questions asked.

Clean Air Optima Humidifier CA-604B Smart Top Filling - Description

Breathe easier and create a comfortable living space with the refurbished Clean Air Optima humidifier CA-604B Smart Top Filling. Designed to boost air quality all year round, this smart humidifier blends convenience, technology, and sustainability for a healthier home environment.

Why Choose the CA-604B Smart Top Filling Humidifier?

Dry air can lead to restless sleep, dry skin, and tiredness. The CA-604B tackles these problems head-on, delivering clean, balanced humidity with every use. Enjoy effortless operation and smart features that put you in control-perfect for busy households, home offices, and anyone who wants to feel at their best.

Key Features & Benefits

  • Smart App Control: Adjust humidity from anywhere via WiFi or Bluetooth. Set the perfect level for your home, even when you’re out.
  • Top-Filling Design: No more spills or hassle-simply lift the lid to refill the tank.
  • Quiet Comfort: Enjoy peaceful nights and focused workdays with low-noise performance.
  • Room to Breathe: With a generous 3.8L container, this humidifier runs for hours, keeping rooms up to 35m² fresh and comfortable.
  • Sustainable Choice: Refurbished to high standards, this humidifier helps reduce electronic waste and supports a greener future 🌱.
  • Compact & Versatile: Fits neatly in bedrooms, living rooms, or offices without taking up precious space.

How the CA-604B Makes Life Better

  • Wake up energised thanks to optimal humidity levels that support restful sleep and healthy breathing.
  • Work or study at your best-clearer air helps increase focus and comfort through long days.
  • Protect furniture and plants, as balanced moisture prevents warping, cracking, and wilting.
  • Support your family’s well-being by reducing airborne dust and easing dry skin or allergies.

Frequently Asked Questions

How often should I refill the tank?

With its spacious 3.8L capacity, you can typically run the humidifier all day or night before a refill, depending on your chosen settings and room size.

Can I control it remotely?

Yes! Use the dedicated app to adjust humidity, even when you’re away-perfect if you want to return to a comfortable home after work.

Is it suitable for larger rooms?

The CA-604B works best in small to medium rooms (up to 35m²), such as bedrooms, nurseries, offices, or living rooms.

How does buying refurbished help the environment?

Choosing a refurbished humidifier from refurbed means fewer electronics end up in landfill. You get a reliable, professionally checked device while making a more sustainable choice for the planet.

Peace of Mind with Every Purchase

Enjoy confidence every day-your refurbished humidifier comes with a minimum 12-month warranty and a 30-day free return policy. Experience the refreshing difference while supporting a cleaner, greener world.

The refurbed Process

Every refurbed device is refurbished in up to 40 steps — taking it from used to like new again. Here are 5 key steps:

Refurbisher buys used electronics

1. Supplier buys pre-loved tech

Deleting the data from used electronic devices

2. Data cleanse

Refurbishing defective components

3. Swap of faulty parts

Polishing the exterior of used electronics

4. External preparation

Refurbisher sells the devices through refurbed marketplace

5. Sold via refurbed

Learn more

What is refurbed?
Refurbed is an online marketplace for refurbished electronics. All refurbed Clean Air Optima Humidifier CA-604B Smart Top Filling function like new, but are much cheaper. How is that the case? Once sourced, experts put our products through an up to 40-step refurbishment process to ensure that all products work and look like new. This results in us offering better value products that are also more sustainable.
Why should I buy my Clean Air Optima Humidifier CA-604B Smart Top Filling from refurbed?
refurbed Clean Air Optima Humidifier CA-604B Smart Top Filling are great value, at up to 40% cheaper than new. Equally as important is trust. We give you a minimum 12-month warranty on each device and a 30-day free trial period, during which you can return for a full refund. This means you save money, and get to test the device to make sure it works perfectly for you.
Why are refurbed Clean Air Optima Humidifier CA-604B Smart Top Fillings so cheap?
Every refurbed partner is specialised in certain brands. They mostly buy exhibit and corporate phones in large quantities at low prices. Their specialisation makes the renewal processes very efficient, resulting in 100% renewed products that are up to 40% cheaper than new devices.
What exactly do the product grades mean?
refurbed Clean Air Optima Humidifier CA-604B Smart Top Fillings work like new devices and therefore have no functional limitations. The visual condition of the devices can be selected based on your needs. What are the visual categories?

Premium (AA-Grading)
Premium Clean Air Optima Humidifier CA-604B Smart Top Fillings are visually identical to new, with no visible signs of wear or use. No scratches, scuffs, dents, or blemishes on the body or screen.
Excellent (A-Grading)
Excellent Clean Air Optima Humidifier CA-604B Smart Top Fillings have no dents, scratches or signs of wear visible from a distance of 30cm - neither on the body nor on the display.
Very Good (B-grading)
Very Good Clean Air Optima Humidifier CA-604B Smart Top Fillings may have minimal dents, scratches or wear on the body that can be seen from 30cm away. There may be micro-scratches on the display/screen, but these are not visible when the display is on.
Good (C-Grading)
Good Clean Air Optima Humidifier CA-604B Smart Top Fillings have visible signs of use such as scratches and/or dents on the body. There may be micro-scratches on the display/screen, but these are not visible when the display is switched on.
How does the 30-day free trial work?
If you want to return your product for any reason, you can return it free of charge within 30 days. To do so, contact our partner directly via your refurbed account and let them know that you would like to exchange or return your device. You will receive a free return label from our partner by email or in your refurbed account. Alternatively, you can contact our refurbed customer service. We will be happy to help you and contact our partner.
What are my warranty terms?
We offer a minimum 12-month warranty on all refurbed Clean Air Optima Humidifier CA-604B Smart Top Filling. This covers all/any technical defects might occur during this period, and are not caused by your own fault.

Examples are:
- The device can no longer be switched on.
- The unit cannot find a network.
- The loudspeaker does not work.

The battery is also covered by the warranty. A distinction is made between wear and tear and technical defects. Technical defects are covered by the warranty and are characterised by abnormal behaviour. Abnormal behaviour could be, for example, that the device can only be charged up to 40%. Please note, your min. 12-month warranty is refurbed's voluntary commercial promise to you. This does not impact your statutory consumers rights
How can refurbed guarantee the quality of your Clean Air Optima Humidifier CA-604B Smart Top Filling?
Only professional and certified partners are allowed to offer their electronic products via refurbed. We ensure this with ongoing quality tests and constant monitoring. Our partners are all located within the EU. This allows us to guarantee fast delivery times and optimal contact to always perform our best.
Which environmental protection projects do we invest in?
We have planted over 6.6 million trees since our foundin, and we are very proud! We realised that planting trees alone does not tackle all of the environmental issues we a passionate about, however. That's why we now also support projects that
- restore landscapes — ecosystems are repaired and jobs are created, including tree planting along the way
- remove carbon from the atmosphere and store it permanently
- recycle electronic waste and reuse materials

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