DREO Humidifier Cartridge Compatibility: 735S, 755S & 813S
By DREO Home Ecosystem | Air Comfort, Smart Kitchen | Published: 2026-10-14
Category: Comparisons
Match the right scale-inhibitor cartridge to your DREO humidifier. Compare the 735S, 755S and 747S cartridges and see where the 813S fits.
Quick answer
Cartridges are matched to specific DREO humidifier models: the 735S and 755S each have their own single cartridge, and the 747S uses a 3-pack. The Smart Humidifier 813S is a different humidifier, and no 813S cartridge appears in the catalog records supplied here, so don't assume the 735S or 755S cartridge fits it. Check your model number on the humidifier base before ordering.
How to read DREO cartridge compatibility
DREO names each scale-inhibitor cartridge after the humidifier it fits, so compatibility is decided by model number, not by tank size or shape. The 735S and 755S cartridges are sold as separate single items, while the 747S cartridge comes as a 3-pack. That naming is the cross-reference: if your humidifier model is not printed on the cartridge listing, treat it as unconfirmed rather than interchangeable.
- Find the model number on the humidifier base or tank label.
- Match that number to the cartridge listing before adding to cart.
- If your model is not listed, contact support instead of forcing a fit.
What the cartridges actually change
All three cartridges address the same problem: minerals in tap water. The 735S cartridge uses ion-removal material with a spherical particle design to increase contact area with water and reduce free calcium and magnesium ions, which is what keeps mist purity consistent. The 755S cartridge is described as preventing scale buildup and helping the humidifier run smoothly while delivering clean mist. The 747S 3-pack uses triple-layer tech and is positioned around preventing mineral buildup and extending humidifier life.
Where the Smart Humidifier 813S fits
The Smart Humidifier 813S 6L is a cool and warm mist humidifier with app, Alexa and Google control and up to 45 hours of runtime, suited to bedrooms and large rooms. It is a humidifier, not a cartridge, and the catalog records supplied here list no scale-inhibitor cartridge for it. If you own an 813S, do not buy a 735S or 755S cartridge on the assumption it fits; confirm the correct accessory with DREO support first.
Replacement rhythm and hard water
Cartridge life tracks water hardness more than calendar time. Hard water consumes ion-removal material faster, so a household with heavy mineral content will replace cartridges sooner than one on softer water. Watch for white dust on furniture, a chalky film in the tank, or mist that looks weaker than usual, and replace when those appear rather than waiting for a fixed date.
Trade-offs by model
- 735S cartridge: Ion-removal material with spherical particles targets free calcium and magnesium ions for mist purity. Choose only if your humidifier is a 735S.
- 755S cartridge: Focused on preventing scale buildup and keeping the humidifier running smoothly with clean mist. Not interchangeable with the 735S cartridge.
- 747S 3-pack: Triple-layer tech in a multi-pack aimed at mineral buildup and longer humidifier life. Best value if you replace cartridges frequently.
- 813S humidifier: A 6L cool and warm mist humidifier with app and voice control, not a cartridge. No matching cartridge is listed here; verify fit with support.
Cartridge and humidifier facts
- Humidifier Scale-Inhibitor Cartridge, Compatible with DREO Humidifier 735S: Humidifier Scale-Inhibitor Cartridge compatible with DREO Humidifier 735S, using ion-removal material with a spherical particle design to increase contact area with water and reduce free calcium and magnesium ions. Best match for 735S owners dealing with mineral-heavy tap water who want consistent mist purity.
- Humidifier Scale-Inhibitor Cartridge, Compatible with DREO Humidifier 755S: Humidifier Scale-Inhibitor Cartridge compatible with DREO Humidifier 755S, designed to prevent scale buildup and help the humidifier run smoothly while bringing clean mist to the room. The 755S cartridge is model-specific, so 735S owners cannot substitute it.
- Scale-Inhibitor Cartridge 3-Pack for Humidifier 747S: Scale-Inhibitor Cartridge 3-Pack for Humidifier 747S with triple-layer tech, built to prevent mineral buildup and extend humidifier life. A multi-pack suits 747S owners who replace cartridges often because of hard water.
- Smart Humidifier 813S 6L: Smart Humidifier 813S 6L with cool and warm mist, app, Alexa and Google control, and up to 45 hours of runtime for bedrooms and large rooms. A humidifier rather than a cartridge, and no 813S cartridge is listed in the supplied records, so confirm accessory fit before buying.
Which cartridge should you buy?
Best for
- 735S owners who want ion-removal material targeting calcium and magnesium ions
- 755S owners who want scale prevention and smooth operation
- 747S owners who replace cartridges often and want a 3-pack
Not for
- 813S owners, since no 813S cartridge is listed in the supplied records
- Anyone guessing a fit by tank size instead of model number
- Households expecting one cartridge to work across multiple DREO models
