Why is this so expensive?

Supposedly the "BONECO Aqua Pro 2-in-1 Humidifier Filter A250" is a replacement for the 7531 demineralization cartridge, and it's priced much more reasonably.

I know granules are disposable, but what is shelf life of this cartridge? Can it be refilled over and over forever?

We usually use the refill. There is a fine netting at the bottom of the cartridge for the water to filter through. Ours has just, for the first time with running two units--one 4 years and one 2 years, had the netting break in one that is two years old which resulted in the granules spilling into the entirety of the humidifier. It was a bit of a mess to clean up, but not too terrible. Worst part was that we had just refilled a few days prior. So, in short, yes, can be refilled over and over for quite some time, but not forever. I would recommend checking the netting at the bottom after dumping old granules and before replacing with new ones for structural integrity.

One ct at $15.99; 2pk at $60.99? I'm obviously misreading something. Please clarify.

That has to be a typo. I'll do two at $31.98. : )

Does this fit the aos 7135 model?

Yes! We have two best we ever owned.

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💦 Elevate Your Humidity Game!

TRANSFORM YOUR AIR - Experience pure, mineral-free mist for a refreshing atmosphere.
SUSTAINABLE SOLUTION - Refillable design promotes eco-friendly practices while enhancing your space.
LIMESCALE FREE LIVING - Say goodbye to limescale buildup and hello to clean air.
EFFORTLESS MAINTENANCE - Quickly replace cartridges or top-up granules every 2-3 months.
UNIVERSAL COMPATIBILITY - Works seamlessly with a wide range of BONECO & AIR-O-SWISS humidifiers.

The BONECODemineralization Cartridge 7531 delivers a consistent water mist free from minerals and limescale, ensuring a clean and refreshing environment. Designed for easy cartridge replacement or granule top-ups every 2-3 months, it is compatible with a variety of BONECO and AIR-O-SWISS ultrasonic humidifiers, making it a versatile choice for maintaining optimal humidity levels.

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