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Boneco A250 Aqua Pro Demineralization Cartridge
OEM part number(s): A250, A7531 (predecessor) · Made by Boneco / Air-O-Swiss · Demineralization cartridge
Verified prices (checked 2026-11-11)
| Option | Price | Store & shipping |
|---|
No US-dollar price is listed: Boneco's global store lists the A250 at CHF 19.90 (Swiss francs — not converted here, because a converted figure would not be a real US price), and no US retailer price was verified on 2026-11-11. Check boneco.com's US store for current pricing.
How to read this: the lowest verified price above is the headline even when it is not Amazon. Amazon is the buy button because it is this site's affiliate route; its price is not quoted because Amazon blocks automated price reads.
Exact fit — models that take this part
Boneco / Air-O-Swiss 7133, Boneco / Air-O-Swiss 7135, Boneco / Air-O-Swiss 7142, Boneco / Air-O-Swiss 7144, Boneco / Air-O-Swiss 7145, Boneco / Air-O-Swiss 7147, Boneco / Air-O-Swiss U600, Boneco / Air-O-Swiss U650, Boneco / Air-O-Swiss 2055, Boneco / Air-O-Swiss 2055A, Boneco / Air-O-Swiss E2441, Boneco / Air-O-Swiss U200, Boneco / Air-O-Swiss U700
How many per change: Screws into the water tank cap of the listed Boneco/Air-O-Swiss ultrasonic models.
Specifications
| Replacement interval | Replace every 3–6 months depending on water hardness (Boneco). |
|---|---|
| Treatment | 2-in-1 demineralization + water purification cartridge (Aqua Pro). |
Equivalents and cross-references
| Brand | Part number | Note |
|---|---|---|
| Boneco | 7531 | The A250 is the current name for the cartridge long sold as the Air-O-Swiss/Boneco 7531 — the 7531-era model list below takes the A250. |
Sources
Full record, including descriptor data for every model, is in the open dataset: /data/parts.json.