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Waterdrop Replacement  for Filtrete Standard 3US-AF01 Under Sink Water Filter (4736934805586)
Waterdrop Replacement  for Filtrete Standard 3US-AF01 Under Sink Water Filter (4736934805586)

Waterdrop Replacement for Filtrete Standard 3US-AF01 Under Sink Water Filter


21 reviews


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  • Standard under sink water filter 3US-AF01 adopts advanced coconut carbon shell that can reduce 98% of chlorine, giving you fresh taste.
  • Food-grade plastic housing ensures you pure water.
  • Cost-effective product reduces your budget with 2 times of replacement per year.
  • Stable and fast water flow always meet your need.
33-100 °F / 0.6-38 °C
Filter capacity:
2,000 gallons (7570 liters) / 6 months
Filtration performance with Waterdrop filtrete water filter 3US-AF01 replacement
Activated carbon filtration, usually in the form of high-performance carbon block filters, is the cornerstone of most under sink filtration system. Waterdrop 3US-AF01 replacement adopts the premium carbon materials from Sri Lankan coconut shell, which achieves a superior reduction performance. With our high-quality filter, it helps reduce chlorine, bad taste, odor, rust, sediment and more harmful elements, aiming to provide you fresh and healthy drinking water.
How does under sink water filter work?
Conventional under sink filter: It receives water from the under sink cold water pipe and water flows from a flexible plastic tube to the water filter. And the water will be delivered to the user through the filter's own special faucet, installed on top of the sink. The system is under constant pressure so that when the user opens the filter's faucet, the sink water will flow through the filter and out the faucet.
Simple under sink filter: In this arrangement the cold-water is diverted through the filter and filtered water is dispensed through the regular cold-water sink faucet. Besides, the hot water won’t be filtered. The simple under sink filter without a separate is becoming more popular and more practical with the advent of flexible rather than hard copper under sink piping. Flexible delivery pipes make the under sink water filter installation simple and affordable.

What about the filtering performance of this 3US-AF01 replacement?

This food-grade Waterdrop filtrete water filter 3US-AF01 replacement adopts advanced coconut shell carbon materials, which can reduce chlorine (taste, odor and particulates) to deliver great-tasting Waterdrop filtered water.

How often should you change 3US-AF01 filter?

Our standard under sink water filter 3US-AF01 replacement is cost-effective as you only need to replace your filters every 2,000 gallons of filtered water or every 6 months whichever comes first. We can offer you a reasonable price but also maintain the quality.

Why do I need to replace my under sink filter?

Waterdrop under sink water filter replacement is easy to install and have no tools required.

Do I need a sediment filter for well water?

From the professional perspective, we recommend you to install a sediment filter or a whole house filter if you rely on the well water.

Will this work as a WHCF-SRC replacement filter?

Waterdrop filtrete water filter 3US-AF01 replacement can fit Whirlpool WHCF-SRC.

Does this fit the 3M C-CS-FF filter?

If you look on the owner’s manual, you will see that the filter is 11.1 x 7 x 3.6 inches
Waterdrop Countertop Reverse Osmosis System
Efficient filtration
Our standard under sink water filtration filter can reduce 98% chlorine and more other contaminants. Waterdrop is always dedicated to providing you healthy and fresh drinking water.
Supreme materials
  • Adopting coconut shell carbon block from Sri Lanka, the filter can absorb chlorine and reduce unpleasant tasting.
  • The 3US-AF01 uses food-grade plastic housing to prevent contaminants leaching back to your water.
Premiun material
Perfect fit your original brand
The filter is designed to fit your original brand, leaving you absolutely no worries about water leak.
Stable & fast water flow
The replacement can produce water quickly with stable and fast low, thereby meeting the needs of your whole family and even small companies.
The Waterdrop WD-3US-AF01 is compatible with following model numbers:

3M Filtrete

Filtrete 3US-AF01, 3US-AS01

Other Brands

Waterdrop WD-3US-AF01, AquaCrest AQU-3US-AF01, Swift Green Filters SGF-AF01, Filters Fast FFUS-003

*The following claims have not been tested and certified by NSF: compatibility claims.
The above statement is accordance with the NSF General Policy 25. Please note the certification information is only applicable to Waterdrop, not representing other brands on this page.

**The above brands do not source or sponsor the water filter. The manufacturers' names and model numbers have been used for reference purposes only.
The manufacturer is HongKong Ecoaqua Co., Limited. Made in P.R.C

Customer Reviews
5.0 Based on 21 Reviews
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Filter Reviews:
Jim M.
Good filters to substitute for the Original Filtrete filters.

These are effective replacements for 3US-PF01 Filtrete high capacity, under-sink filtration systems.
We have water with a heavy mineral content in this part of Jefferson City, MO. It means the water has a OK taste, but not really good, kind of a dusty flavor. So, since I drink a lot of water and make a lot of ice trays, I wanted something to make the experience better.

Hence, I installed the Filtrete system. I knew the filters were expensive, running at around $50 a pop, plus tax, but for good-tasting water, it was better than a pitcher or a Pur system, for my money. The long-life filter is designed to go six months, or over 1000 gallons of water. That's 10 Pur filters, by the way, or $140 worth of filters!

The water tastes good, and makes really good ice cubes. It also improves the flavor of meals that need water in cooking. The water flow is also better than a Pur faucet filter, due to the extra size and filtration capacity. Well worth the money.

These filters are easy to change, too. I have my unit installed just inside my right under-sink cabinet, against the side wall. This allows easy changes without blocking access or requiring that I get down on hands and knees to make changes. A simple ? twist to the left to unseat the filter, then pull it down and out. A few drops of water will drip, but cleanup is easy, no big messes. Then press the new filter onto the stem, and twist to the right to seat it. Run for 10 minutes to fill and flush the filter, then take a sticker and either place it on the filter, or a more visible place if desired.

I take and go six months into my phone calendar and set a reminder to change the filter six months later, and set it to Repeat every six months later. Very handy to do that!

Perfect Replacement

Perfect replacement to the original filter. Great value too.

Ernest E. Cantrell
Price and quality


Decent but not great

Works well but doesn't last as long as expected. 3 months at best instead of 6

Works fine.

Nice replacement for Filtrete filters.