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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BONECODemineralization Cartridge 7531

Product ID: 1052561

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Description

Please exchange cartridge every 2 ? 3 months
Hard water usage may require more frequent replacement.
Included in most AOS units.
Easy to install
Can dispose after use
Hard water usage may require more frequent replacement
Included in most AOS units

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