Bosch Refrigerator Water Filters

Bosch refrigerators concentrate on three filter lines: the 9000 194412 UltraClarity cartridge (81 models in our fit library), the 3M CS-52 retrofit cartridge (41 models), and the BORPLFTR55 used on built-in platforms (22 models). Bays are internal twist or slide depending on chassis generation.

Bosch is the volume brand of the BSH group (Bosch · Siemens · Thermador · Gaggenau), and the parts pool is shared — the 194412 cartridge also appears across 20 Thermador-directory models in our library. That matters for sourcing: a cartridge listed under either badge is the same part. What it doesn’t mean is that every Bosch takes it — the CS-52 line looks similar and seats differently, so the model number, not the brand, picks the cartridge.

155

models in the verified fit library

filter lines (194412 · CS-52 · BORPLFTR55)

52%

of the fleet runs the 194412 cartridge

Same machine, different badge: BSH siblings Thermador and Gaggenau (shared parts pool) refrigerators on this parts platform use identical bays — search either badge in the model finder.

Know your model number?

Type your model number — we show the exact filter and its best price.

e.g. B36CT80SNSFind →

Model plate is inside the fridge compartment, left wall · or browse by series below

The Bosch filter system at a glance

Bay / system	Part numbers	Models in fit library
9000 194412 UltraClarity main line	9000 194412 · BORPLFTR50	81
3M CS-52 retrofit/compat line	3M CS-52	41
BORPLFTR55 built-in platforms	BORPLFTR55	22

Counts from the verified fit library. The 194412 cartridge is shared across BSH-group platforms — the same part serves many Thermador-directory models.

Browse by refrigerator series

Know the model number, not the series?

The 155 Bosch models in our fit library live in the model-number browser — B-series built-ins first, 500/800 series freestanding behind them.

A–FB-series built-in coreB36/B48 built-in counter-depth platforms124 models N–S500 · 800 series500/800 series freestanding platforms16 models G–MMid-generation variantsmid-generation and EU-market platforms10 models T–ZLate & Thermador-sharedlate platforms sharing BSH parts5 models

Thermador owner? Check the Thermador hub — the 194412 cartridge is shared across the BSH group, and your model may be indexed under either badge.

Bosch filter guides

reset · 90/mo

Reset the Bosch filter indicator

Home Connect and classic panels differ — both reset paths, step by step.

change · 40/mo

Change a Bosch 194412 cartridge

The internal bay release and the priming steps most skips cause sputter.

replace · 40/mo

CS-52 vs 194412 — which Bosch bay?

The two lines look alike and seat differently. One check settles it.

Bosch filter FAQ

Which water filter does my Bosch refrigerator use?

Three cartridges cover the range in our library: the 9000 194412 UltraClarity part on most freestanding machines (81 models), the 3M CS-52 retrofit line (41), and the BORPLFTR55 on built-in platforms (22). The bay design varies by chassis generation, and the CS-52 and 194412 are not interchangeable despite similar silhouettes. Your model plate is inside the compartment; the finder resolves all 155 mapped Bosch models to the correct line.

Are Bosch and Thermador filters the same?

Often, yes — both are BSH-group brands sharing one parts pool. The 9000 194412 cartridge that dominates the Bosch range also serves 20 Thermador-directory models in our fit library. The practical effect: listings under either badge for the same part number are the same cartridge, which widens your sourcing options. The caveat is platform-specific — some Thermador built-ins use dedicated lines, so match by model number rather than assuming group-wide interchange.

How often should a Bosch refrigerator filter be changed?

Bosch specifies a 6-month cycle for the UltraClarity cartridge. The indicator on the panel (or in Home Connect on connected models) counts time, not volume — gallons consumed don’t advance it. German-built dispensing systems are also noticeably flow-sensitive: a loaded cartridge shows up as slower dispensing before any taste change. If flow drops at month five, that’s the cartridge, not the plumbing.

What is the 3M CS-52 cartridge in my Bosch?

The CS-52 is the 3M-manufactured line that served a generation of Bosch platforms — it appears on 41 models in our library, often machines sold under joint Bosch-3M parts arrangements. It’s a legitimate OEM-lineage cartridge, not a generic: the bay it seats in differs from the 194412 bay, so “upgrading” between them isn’t possible. If your machine shipped CS-52, that’s the line it takes; the model lookup confirms it in one step.

Where can I buy a Bosch water filter?

Through Bosch parts channels, appliance parts dealers, and the compatible-cartridge market — our library covers 155 Bosch models and each model page lists verified options with real pricing. Because the BSH pool is shared, Thermador-badge listings for the 194412 part are equally valid. The one channel to treat carefully is marketplace listings quoting only “Bosch filter” with no part number — the three lines seat differently, and the part number is the only safe key.