Boneco A250 Aqua Pro Demineralization Cartridge

OEM part number(s):

A250A7531 (predecessor)

Made by Boneco / Air-O-Swiss. Replacement interval: Replace every 3–6 months depending on water hardness (Boneco)..

Exact fit — verified

Fits 13 models

Across 1 brand(s): Boneco / Air-O-Swiss. Examples: 2055, 2055A, 7133, 7135, 7142, 7144, 7145, 7147, E2441, U200, U600, U650, U700 — the complete verified fit list is on this page.

Cross-brand equivalents

1 verified equivalent(s): Boneco 7531 — full table below.

Prices checked 2026-11-11: no verified in-stock price was captured — we never guess one. See the price notes below.

Buy on Amazon — A250

Amazon is a buy link, not a price claim: Amazon blocks automated price reads, so its price is never quoted here.

Exact fit — all 13 verified models

Harvested from published manufacturer and retailer fit lists (sources at the bottom of this page). If your exact model is not listed, do not assume fit — check the number on your current part.

Boneco / Air-O-Swiss (13)

2055

2055A

7133

7135

7142

7144

7145

7147

E2441

U200

U600

U650

U700

Aftermarket equivalents

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.

All verified prices

Kind	Store	Pack	Price	Shipping	Checked

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.

Specs

Replacement interval	Replace every 3–6 months depending on water hardness (Boneco).
Treatment / media	2-in-1 demineralization + water purification cartridge (Aqua Pro).
Quantity note	Screws into the water tank cap of the listed Boneco/Air-O-Swiss ultrasonic models.

Sources

https://www.boneco.com/