Waterdrop CS-52 Refrigerator Water Filter, WD-F26B

Waterdrop CS-52 WD-F26B is a replacement refrigerator water filter listed for Bosch 640565 and a range of other filter models. The listing claims chlorine reduction, NSF 42 and NSF 372 certification, and recommends replacement at 300 gallons or six months, whichever comes first.

At a glance

Listed as a replacement for Bosch 640565 and several other refrigerator-filter models.
The listing claims NSF 42 and NSF 372 certifications and chlorine reduction.
Recommended service interval is six months or 300 gallons, whichever comes first.
The installation description says no tools are needed and includes instructions to flush water through the dispenser after fitting.

Price

$26.99Save 10%

Reference price: ~~$29.99~~

Price checked: Nov 12, 2026

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Pros and cons

Pros

The listed compatibility covers several filter families, including Bosch 640565, Cuno CS-52 and Whirlpool WHKF-R-PLUS.
Month-install stickers are listed as a way to track when the filter was installed.
The stated replacement interval gives buyers both a time and volume limit to monitor.

Technical specifications

5 specifications

Identity
Brand	Waterdrop
Model	WD-F26B

Dimensions and installation
Dimensions listed	7.48"D x 2.6"W x 9.45"H
Weight listed	10.56 ounces

Materials and protection
Material listed	Lead-Free Material, Food-Grade Material, Advanced Activated Coconut Carbon Block

What to know before buying

Compatibility is model-specific. Compare your refrigerator's required filter number with the listing's compatibility information before ordering. The listed filter specifications and certifications are manufacturer claims.

What’s in the box

Included

Month install stickers
3 refrigerator water filter replacements
1 user manual

Who is it for?

A good fit for

Owners of refrigerators that require Bosch 640565 or another specifically listed compatible filter.
Buyers who want installation-date stickers and a stated six-month or 300-gallon replacement interval.

Less suited to

Buyers whose refrigerator filter number is not confirmed as compatible with the models listed.

Waterdrop CS-52 Refrigerator Water Filter, WD-F26B · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 157 ratings

5 stars81%81%
4 stars12%12%
3 stars4%4%
2 stars1%1%
1 star2%2%

Customer feedback highlights reported fit, functionality and taste, with customers also describing the filter as good value. These perceptions may matter to buyers replacing a compatible refrigerator filter, but they do not establish compatibility for every refrigerator model. Aggregate ratings are generally favorable, though ratings alone do not explain individual experiences.

Positive themes

Customers report good fit and functionality.
Customers appreciate the taste and value for money.

Frequently asked questions

Which refrigerator filters is the WD-F26B listed to replace?

The listing names Bosch 640565, Cuno CS-52 and CS-51, Whirlpool WHKF-R-PLUS and other filter numbers. Confirm the exact filter model required by your refrigerator before buying.

How often should this filter be replaced?

The listing recommends replacing it every six months or 300 gallons, whichever comes first. It notes that water conditions can affect service life.

What should I do after installing the filter?

The listing instructs users to run water through the dispenser for five minutes at 0.5gpm (about 2.5 gallons) to clear the system and prevent sputtering.