Bosch Refrigerator Water Filter Replacement (UltraClarity Pro): 2026 Guide
Bosch refrigerators carry one of the strongest reputations in residential appliances for build quality and longevity. The water filter side of Bosch ownership is where the experience tends to fragment. Bosch produces multiple cartridges across the 500 Series, 800 Series, and Benchmark lines, and the OEM part numbers can be confusing for first-time replacement buyers. This guide simplifies the Bosch refrigerator filter lineup, breaks down which cartridge fits which Bosch refrigerator, and explains the difference between the original UltraClarity and the newer UltraClarity Pro.
The Bosch Refrigerator Filter Lineup
Bosch consolidated its refrigerator filter brand under UltraClarity Pro for current production. The legacy UltraClarity and the older 740560 cartridge remain in production for the installed base of older Bosch refrigerators.
| Cartridge | Common Use | NSF Certifications |
|---|---|---|
| UltraClarity Pro | Current Bosch 500, 800, and Benchmark French-door | 42, 53, 401 |
| UltraClarity (original) | Older Bosch French-door (pre-2019) | 42, 53 |
| 740560 | Legacy bottom-freezer models | 42 |
| 644845 | Older bottom-freezer models | 42 |
If your existing cartridge says "UltraClarity Pro," "UltraClarity," "740560," or "644845" on the body, you have one of the matches in the table above. The cartridge label is the most reliable verification source.
UltraClarity Pro: The Current Bosch Standard
The UltraClarity Pro is the current Bosch refrigerator filter for the 500 Series, 800 Series, and Benchmark French-door refrigerators. The cartridge represents Bosch's premium tier with full NSF 42/53/401 certification.
Quick Specs
| Spec | Value |
|---|---|
| OEM part number | UltraClarity Pro |
| Bosch internal code | 11032531, 11034151 (production variants) |
| Replaces | UltraClarity (original) on most newer refrigerators |
| Capacity | 200 gallons |
| Replacement interval | 6 months or 200 gallons |
| Connection | Twist-on quick-change |
| Certifications | NSF/ANSI 42, 53, and 401 |
What the UltraClarity Pro Removes
The UltraClarity Pro carries the premium tier NSF 42/53/401 certification profile:
- Lead and mercury (NSF 53)
- Cysts including Cryptosporidium and Giardia (NSF 53)
- Asbestos (NSF 53)
- Chlorine taste and odor (NSF 42)
- Particulates Class I (NSF 42)
- Pharmaceuticals including ibuprofen, naproxen, atenolol (NSF 401)
- Pesticides and endocrine disruptors (NSF 401)
- Industrial compounds (NSF 401)
The NSF 401 certification places the UltraClarity Pro in the same tier as the LG LT1000P, Whirlpool EDR1RXD1, and GE RPWFE/XWFE cartridges. For Bosch owners specifically choosing the brand for premium filtration, the UltraClarity Pro is the right cartridge.
UltraClarity Pro Compatible Models
The UltraClarity Pro fits Bosch French-door refrigerators built from approximately 2019 forward. Common compatible Bosch model series:
- 500 Series French-door
- 800 Series French-door
- Benchmark French-door
- B36 series (counter-depth French-door)
- B30 series (counter-depth French-door)
Bosch publishes a compatibility list on its support site indexed by refrigerator model number. The model number sticker is typically located on the inside-door panel.
UltraClarity (Original): The Legacy Bosch Standard
The original UltraClarity cartridge preceded the UltraClarity Pro. It remains in production for the installed base of Bosch refrigerators built before approximately 2019.
Quick Specs
| Spec | Value |
|---|---|
| OEM part number | UltraClarity |
| Bosch internal code | 740560, 644845 |
| Capacity | 200 gallons |
| Replacement interval | 6 months |
| Connection | Twist-on quick-change |
| Certifications | NSF/ANSI 42 and 53 |
Difference Between UltraClarity and UltraClarity Pro
Both cartridges share the same housing geometry and replacement procedure. The UltraClarity Pro adds NSF 401 certification (pharmaceuticals, pesticides, emerging contaminants) over the original UltraClarity. The UltraClarity Pro uses a denser carbon block to support the broader contaminant reduction profile.
For Bosch refrigerators that originally shipped with the UltraClarity, the UltraClarity Pro is a drop-in upgrade. For Bosch refrigerators that originally shipped with the UltraClarity Pro, either cartridge will fit, but the UltraClarity Pro maintains the original certification level.
Legacy Bosch Cartridges (740560, 644845)
Bosch continues to produce legacy part numbers for older bottom-freezer refrigerators that did not transition to the UltraClarity platform.
- 740560 fits older Bosch bottom-freezer models, NSF 42 certification
- 644845 fits older Bosch bottom-freezer models with the legacy housing
If your existing cartridge carries one of these legacy part numbers, you can order the same legacy part for direct replacement. The legacy cartridges remain widely available through authorized Bosch retailers.
How to Replace a Bosch Refrigerator Filter
The replacement procedure is similar across UltraClarity Pro, UltraClarity, and the legacy cartridges. Total time is under two minutes plus a flush.
- Locate the cartridge. Bosch refrigerators position the filter behind a small panel inside the upper-left or upper-right corner of the fresh food compartment on most French-door models, or behind a bottom-grille panel on bottom-freezer models.
- Turn the existing cartridge counter-clockwise approximately a quarter turn. You will feel it release.
- Pull the cartridge straight out. A small amount of water will drip. Have a paper towel ready.
- Remove the new cartridge from packaging. Pull off the protective cap and avoid touching the O-ring with bare hands.
- Insert the new cartridge into the housing with the orientation matching the housing slot. Push gently and rotate clockwise a quarter turn until the cartridge locks.
- Reset the filter indicator by holding the "Filter" or "Reset" button on the control panel for 3 to 5 seconds. On some Bosch models the reset is automatic after the cartridge is installed.
- Flush the new cartridge by dispensing approximately 2 gallons of water before drinking. The first cup or two may appear cloudy from carbon fines. The cloudiness clears within a minute.
When to Replace a Bosch Filter
Bosch specifies replacement every 6 months or 200 gallons of filtered water, whichever comes first. The 6-month calendar interval is the binding constraint for most households.
Signs the cartridge is past due:
- Filter indicator on the control panel
- Reduced flow from the water dispenser
- Returning chlorine taste in filtered water
- Slower ice production
- Cloudy water that does not clear within a minute
Bosch refrigerators tend to have a more sensitive Replace Filter indicator than some other brands. The indicator may trigger slightly before the 6-month mark if the cartridge sees heavy use.
Subscribe and Save: Built for Bosch Owners
The Bosch 6-month replacement cycle pairs well with subscription delivery. Every 6 months, a fresh UltraClarity Pro arrives a few days before the install date with email reminders if you want them. Skip, pause, or cancel any shipment without penalty.
Bosch refrigerator owners tend to keep their refrigerators for 12 to 15 years. The subscription model removes 24 to 30 individual ordering decisions over the refrigerator's lifetime, plus the discount stacks across every cartridge in the subscription.
Authentic vs Aftermarket Bosch Cartridges
The genuine Bosch UltraClarity Pro and UltraClarity cartridges are manufactured to Bosch specifications with NSF certifications. Aftermarket "Bosch-compatible" cartridges fit the same housings but vary in NSF certification and carbon density.
Things to verify on any aftermarket cartridge:
- NSF certification numbers printed on the packaging
- O-ring fit matches the original Bosch housing dimensions
- Carbon density matches the original specification
For Bosch refrigerators specifically, OEM is strongly recommended because the cartridge connection is more sensitive to dimensional tolerances than some other brands. Aftermarket cartridges that fit produce water but may cause intermittent indicator issues or premature seal failure.
Bosch Refrigerator Filter Lineup Summary
| Cartridge | Primary Use | Capacity | Certifications |
|---|---|---|---|
| UltraClarity Pro | Current Bosch 500/800/Benchmark French-door | 200 gal | NSF 42/53/401 |
| UltraClarity (original) | Older Bosch French-door (pre-2019) | 200 gal | NSF 42/53 |
| 740560 | Legacy bottom-freezer models | 200 gal | NSF 42 |
| 644845 | Older bottom-freezer models | 200 gal | NSF 42 |
Ordering Bosch Refrigerator Filters
Poseidon Filters carries the authentic Bosch UltraClarity Pro, UltraClarity, and legacy 740560 and 644845 cartridges. Each cartridge is genuine Bosch manufacture, NSF-certified to the standards listed on the packaging, and backed by our satisfaction guarantee.
Order options:
- Single cartridge for one-time purchase
- 2-pack and 3-pack for households that want a year's supply on hand
- Subscribe and save for scheduled 6-month delivery with reorder discount
For households or offices uncertain which Bosch cartridge fits, our support team verifies compatibility by refrigerator model number before you order. Call 855-789-3278 or email info@poseidonfilters.com.
Frequently Asked Questions
What is the difference between UltraClarity and UltraClarity Pro?
Both cartridges share the same housing. UltraClarity Pro adds NSF 401 certification (pharmaceuticals, pesticides, emerging contaminants) and uses a denser carbon block. UltraClarity Pro is a drop-in upgrade for refrigerators that originally took the UltraClarity.
Can I use the UltraClarity Pro in an older Bosch refrigerator that originally took the UltraClarity?
Yes. Bosch designed the UltraClarity Pro to be backward-compatible with the housing used by the original UltraClarity. The cartridge fits and provides upgraded contaminant reduction.
Why does my Bosch refrigerator say Replace Filter so often?
Bosch refrigerators have a more sensitive Replace Filter indicator than some other brands. The indicator can trigger slightly before the 6-month mark if the cartridge sees heavy use. The water dispenser will continue to work even after the indicator triggers.
Does the UltraClarity Pro remove fluoride?
No. The UltraClarity Pro removes lead, mercury, chlorine, cysts, pharmaceuticals, and pesticides. Fluoride removal requires a reverse osmosis system.
Will the legacy 740560 fit my newer Bosch refrigerator?
The 740560 fits older Bosch bottom-freezer models. Newer Bosch French-door refrigerators use the UltraClarity Pro or original UltraClarity. The cartridge label on your existing filter is the verification source.
Can I subscribe to a multi-refrigerator household plan?
Yes. Subscriptions can be set up per refrigerator with coordinated delivery dates. Multi-cartridge subscriptions also stack the subscribe-and-save discount across all cartridges in the subscription.
Is the UltraClarity Pro made by Bosch or by a third party?
Bosch contracts cartridge manufacturing to authorized suppliers but the UltraClarity Pro carries full Bosch quality control and NSF certification. The cartridge is branded and sold as a genuine Bosch part.
Ready to replace your Bosch refrigerator filter? Order the authentic UltraClarity Pro, UltraClarity, or legacy Bosch cartridge from Poseidon Filters. NSF-certified for residential and office use. Single cartridge, multi-pack, or subscribe-and-save. Questions on compatibility, call 855-789-3278.