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The CS521 Refrigerator Filter – 3M™ Cuno CS-52 is a white, cylindrical NSF-certified filter with green and black text and certification icons, shown upright on a plain white background. It uses a coconut shell carbon block for efficient filtration.
Image of the CS521 Refrigerator Filter – 3M™ Cuno CS-52, featuring the NSF logo and text: "NSF Certified Performance," "NSF 42 Aesthetic Benefits," "NSF 372 Lead ≤ 0.25%," plus a coconut shell carbon block material label.
A graphic of the CS521 Refrigerator Filter – 3M™ Cuno CS-52 with coconut shell carbon block, text stating Certified 97.6% Contaminant Reduction for chlorine, taste, and odor, and NSF certification icons.
The CS521 Refrigerator Filter – 3M™ Cuno CS-52 is shown in cross-section with a black coconut shell carbon block. Text highlights Naturally Efficient Filtration, noting coconut carbon’s effective water impurity removal, plus an image of a coconut below.
A woman drinks water while holding a sleeping baby, showing the CS521 Refrigerator Filter – 3M™ Cuno CS-52. Pore diagrams reveal its coconut shell carbon block delivers 2x better adsorption than competitors for safer, cleaner water.
A white NSF-certified CS521 Refrigerator Filter – 3M™ Cuno CS-52 is shown on the right. On the left, text reads "Compatible with:" and lists 3M Cuno, Whirlpool, Bosch, InstPure, and Zip models with coconut shell carbon block filtration.
A woman drinks water in a kitchen beside a CS521 Refrigerator Filter – 3M™ Cuno CS-52. Text: 1 filter saves 3,200 plastic bottles, lasts 6 months or 1,500 gallons. Image of the filter is shown on the right.
A modern kitchen with a stainless steel fridge and the CS521 Refrigerator Filter – 3M™ Cuno CS-52, featuring an NSF-certified water filter. Icons show lead-free, leak-free, tool-free use. Text: “High-Quality Water Made Easy.”.
A chart titled Operating Specifications shows values for the CS521 Refrigerator Filter – 3M™ Cuno CS-52: min temp 33°F (0.6°C), max 100°F (38°C), min pressure 20 psi (140 kPa), max 100 psi (689 kPa), capacity 1,500 gal, flow rate 0.5 GPM.
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The CS521 Refrigerator Filter – 3M™ Cuno CS-52 is a white, cylindrical NSF-certified filter with green and black text and certification icons, shown upright on a plain white background. It uses a coconut shell carbon block for efficient filtration.
Image of the CS521 Refrigerator Filter – 3M™ Cuno CS-52, featuring the NSF logo and text:
A graphic of the CS521 Refrigerator Filter – 3M™ Cuno CS-52 with coconut shell carbon block, text stating Certified 97.6% Contaminant Reduction for chlorine, taste, and odor, and NSF certification icons.
The CS521 Refrigerator Filter – 3M™ Cuno CS-52 is shown in cross-section with a black coconut shell carbon block. Text highlights Naturally Efficient Filtration, noting coconut carbon’s effective water impurity removal, plus an image of a coconut below.
A woman drinks water while holding a sleeping baby, showing the CS521 Refrigerator Filter – 3M™ Cuno CS-52. Pore diagrams reveal its coconut shell carbon block delivers 2x better adsorption than competitors for safer, cleaner water.
A white NSF-certified CS521 Refrigerator Filter – 3M™ Cuno CS-52 is shown on the right. On the left, text reads
A woman drinks water in a kitchen beside a CS521 Refrigerator Filter – 3M™ Cuno CS-52. Text: 1 filter saves 3,200 plastic bottles, lasts 6 months or 1,500 gallons. Image of the filter is shown on the right.
A modern kitchen with a stainless steel fridge and the CS521 Refrigerator Filter – 3M™ Cuno CS-52, featuring an NSF-certified water filter. Icons show lead-free, leak-free, tool-free use. Text: “High-Quality Water Made Easy.”.
A chart titled Operating Specifications shows values for the CS521 Refrigerator Filter – 3M™ Cuno CS-52: min temp 33°F (0.6°C), max 100°F (38°C), min pressure 20 psi (140 kPa), max 100 psi (689 kPa), capacity 1,500 gal, flow rate 0.5 GPM.

CS521 Refrigerator Filter – 3M™ Cuno CS-52

$9.99
Save $10
$19.99

SKU : RFCS521PK

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  • Powerful filtration: filters eradicate harmful contaminants such as lead, chlorine, mercury, dirt, and other impurities
  • Long-lasting: water will look and taste clean throughout the filter's 6-month lifespan
  • Fresh taste: coconut shell carbon block filter absorbs twice as many impurities than alternatives
  • NSF-certified: awarded by the national sanitation foundation for its ability to remove harmful substances
  • Convenient installation: simple installation does not require any tools or hassle
  • Compatible with: 640565, AP3961137, 1257074, CS-52, CS-452, CS-522, CS-532 CS-562, OCS CS-52 CS-51, CS450, CS-512, OCS CS-51 55866-05, 5586605, 55866-06, 5586606 700200002518, EVOLFLTR10, WHKFR-PLUS, WHKFR Plus, WHKF-R-PLUS, WHCF-R-PLUS, W1085590, 56932, 2168701, 8668597, C00094379, C00097913, D846181, 51000, 52000

Many frequently asked questions can be answered in our help center. Here you can find useful information such as shipping policies, warranty information, product guides and more! Brio Help Center

Your order will be fulfilled during our normal business hours (8 a.m. – 5 p.m. PST). Orders placed over the weekend or on holidays will be fulfilled on the following business day.

However, we cannot guarantee same day fulfillment. In general, orders will be shipped out the next business day after you have completed your order.

You may return any unused or undamaged products within 30 days of the original purchase date to receive a full refund. Once you file a return, we will process your refund within 3 to 5 business days.

When you receive your order please make sure to save your original packaging in the event you need to return the product.

To file a return, please visit our returns page here. Please note that you will be responsible for return shipping costs unless the reason for the return is due to an error on our behalf.

Download user manual
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    NSF Certified Performance

    Tested and Certified by NSF International in Model RFCS52 against NSF/ANSI Standard 42 for reduction of the claims specified on the Performance Data Sheet, and to NSF/ANSI 372 (≤0.25% lead).

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    Powerful Filtration

    With a pore size of 0.5 microns, filters out contaminants like chlorine and VOCs, as well as unpleasant tastes and odors, leaving water clean, and looking and tasting great.

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    Incredibly Fresh Taste

    Made using natural coconut carbon block for thorough contaminant adsorption, keeping your water and ice clean. Safe filtration media imparts no contaminants into filtered water or ice.

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    Safe, Healthy Hydration

    With its meticulous filtration, you and your whole family will reliably enjoy water and ice that are clean, healthy, and delicious.

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    For 3M™ Cuno & More

    Designed for complete compatibility with your refrigerator, making installation easy and ensuring a tight, leak-proof seal.

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    Making the World Better

    One filter can save up to 3,200 plastic bottles over a six month lifespan. That's 6,400 plastic bottles a year you can keep out of oceans and landfills.
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