You stand at your refrigerator with a filter light on the display panel. You open the door and pull out the old cartridge. The printed label on the plastic body shows one number. You open the appliance owner manual to the maintenance section. The manual specifies a different number. You search the internet for a replacement and find a box with a third number. This confusion happens frequently with the ultraclarity pro water filter. One physical replacement part carries multiple part numbers.

Water Filters FAST stocks the BORPLFTR55/11032531 UltraClarityPro Bosch Refrigerator Water Filter. Water Filters FAST lists it at $49.99. The item is in stock today. Water Filters FAST carries an extensive selection of Bosch refrigerator water filters for residential appliances. This guide breaks down the different part numbers printed on this replacement.

Written by the Water Filters FAST filter experts. Reviewed by Phil McNamara, owner, Water Filters FAST. Updated September 2026.

What the ultraclarity pro water filter does for your appliance

The Bosch UltraClarity Pro is a genuine OEM water filter cartridge. It reduces impurities and odor from the water used for the ice and water dispenser. The cartridge measures 8-3/8 inches long. It is 2 inches wide. It is 2 inches high. The plastic exterior is white. Water flows through the unit at a rate of 0.55 gpm. The listing gives the capacity as 250/150 gallons. The component handles water temperatures between 35 and 100 degrees F. It accepts an operating pressure from 30 up to 125 psi.

The Bosch UltraClarity Pro page states the product received certification by NSF. Bosch notes the cartridge reduces chloramines, chlorine, mercury, asbestos, and some pharmaceuticals. The Thermador product page states the cartridge reduces chlorine, chloramines, lead, pharmaceuticals, and other contaminants while improving the quality of water for drinking and cooking. The OEM vs aftermarket refrigerator water filter guide explains manufacturer testing standards in detail.

Bosch recommends a replacement every six months. Change the unit when your refrigerator indicates it needs to be changed. The Water Filters FAST guide on how often to replace a refrigerator water filter offers more details about appliance capacity limits.

What the numbers on the listing mean at the sink

The listing prints a flow rate of 0.55 gpm. That is the speed of the water through a fresh cartridge, a little over half a gallon each minute at the dispenser. A slower stream months later points at a cartridge near the end of its life.

The listing prints a capacity of 250/150 gallons. That is the volume of water the cartridge treats before Bosch counts it as spent. A household that fills many glasses and runs the ice maker all summer reaches that volume before the six month date. A small household reaches the six month date first. Change the cartridge at whichever limit arrives first.

The pressure range of 30 to 125 psi and the temperature range of 35 to 100 degrees F describe ordinary household plumbing. A refrigerator on a normal city or well supply sits inside both ranges.

Why one Bosch cartridge carries 19 different part numbers

Large appliance manufacturers operate multiple divisions. A parent company builds units for different household brands. Sister brands like Bosch, Thermador, and Gaggenau share replacement parts. The factory produces one physical cartridge for all of these appliances. The marketing department prints a consumer model name on the retail box. The service department assigns a different internal catalog number to the same part.

External appliance parts distributors add another layer of codes. Warehouses apply their own inventory prefixes to track stock. A distributor might add an AP prefix or a PS prefix to the factory catalog number. This industry practice produces 19 different numbers for one identical item. The table below groups these numbers by their source.

The physical check for your refrigerator filter head

Run one physical check before you buy a new cartridge. Thermador warns customers to check for compatibility with their refrigeration before purchasing. The company notes that a filter head replaced during a repair may take a different cartridge. You cannot rely strictly on the model number of the appliance.

Look at the old cartridge inside your kitchen appliance. Pull the old component out of the slot. Read the printed number on the plastic shell. This physical check takes about ten seconds. Compare the printed number against the list in the table above. The label on the old part overrules any table.

If the old cartridge shows a number not on the list, you need to pause your order. Call the Water Filters FAST team before ordering. The filter experts will help you find the correct replacement for your modified housing.

Consult your owner manual for the housing location and reset steps

Every refrigerator model uses its own interior layout. Your owner manual shows the exact location of your cartridge housing. It also contains the correct twist directions for removing the old part. Do not force the plastic component out of the housing.

You can read a complete guide on how to reset a water filter light for more general tips. Your appliance manual provides the exact button combination for your specific control panel. You will find the reset instructions printed near the end of the maintenance chapter.

Pack arithmetic and saving money on multiples

Water Filters FAST offers multi-pack options for this item. A 1 Pack costs $49.99. A 2 Pack costs $99.98. The two pack sets the price at the same $49.99 each. A 3 Pack costs $146.97. This option sets the price at $48.99 each. The three pack saves $3.00 against buying three singles at $149.97.

A 6 Pack costs $287.94. This bulk option drops the price to $47.99 each. The six pack saves $12.00 against buying six singles at $299.94. Buying in bulk lowers the price of your household maintenance.

You use one cartridge every six months. Three cartridges cover eighteen full months of operation. Six cartridges cover three full years. A multi-pack purchase keeps a fresh part ready when the appliance light activates.

How to confirm the match and reorder

1. Read the label on the old cartridge. Pull the physical part out of the refrigerator housing and look for the model number.
2. Match it to the list. Check your printed number against the part number table in this guide.
3. Note the install date on the new cartridge with a marker. Write the current month directly on the plastic body.
4. Set a phone reminder six months out. Open your calendar app and create an alert for the next swap.
5. Order the pack that covers the year. Select a multi-pack to save money on future maintenance tasks.

Common questions about the Bosch refrigerator water filter

Is 11032531 the same as BORPLFTR55?

Yes. The number 11032531 is a Bosch catalog number. The string BORPLFTR55 is the Bosch retail model name for the identical cartridge. Water Filters FAST stocks one physical item that replaces both numbers.

Does the UltraClarity Pro fit Thermador and Gaggenau?

Yes. Thermador lists this exact cartridge on its parts page. Gaggenau uses the same part under the RA450022 number. Thermador and Gaggenau are sister brands to Bosch.

How often does Bosch say to change it?

The manufacturer recommends a replacement every six months. You should also change the cartridge when the appliance indicates it needs a new one. The filter light on the panel tells you the interval is up.

Is it NSF certified?

Yes. Bosch confirms the filter received certification by NSF. The manufacturer states it reduces chloramines, chlorine, mercury, asbestos, and some pharmaceuticals.

What if my filter head was replaced during a repair?

A new filter head might take a different cartridge. Look at the old cartridge to confirm the part number before you buy a replacement. The physical item inside the appliance tells you exactly what to order.

Is the 3 pack the same cartridge as 11050659?

Yes. Thermador directs customers to order 11050659 when they want a three pack of the 11032531 cartridge. The Water Filters FAST three pack delivers the same three parts to your door.

Order your replacement cartridge today

The BORPLFTR55/11032531 UltraClarityPro Bosch Refrigerator Water Filter is in stock today. Water Filters FAST lists it at $49.99 for a single unit. A 2 Pack costs $99.98. A 3 Pack costs $146.97. A 6 Pack costs $287.94. Shipping is free over $75, and orders under that carry a $5 flat rate.

A 30-day return policy and the Water Filters FAST satisfaction guarantee back every order. Call 855-789-FAST and the filter experts will confirm the match before you buy.