The Waterdrop 3US-MAX-F01 under-sink water filter is a replacement cartridge designed for several Filtrete Maximum Filtration systems and related filter assemblies. It uses an activated carbon block and other filter media to reduce chlorine while maintaining a tested full flow rate of 0.75 gallons per minute. The cartridge connects to the cold water valve only and does not reduce total dissolved solids, commonly abbreviated as TDS.
Quick Overview
This replacement filter is intended for households and other installations that already use a compatible under-sink filtration system. Its primary filtration purpose is chlorine reduction, with materials identified as BPA-free and lead-free. The filter is tested against NSF/ANSI 42 standards, while the selected materials are certified by IAPMO against NSF/ANSI 372.
| Product type | Under-sink replacement water filter |
|---|---|
| Brand | Waterdrop |
| Primary reduction claim | Chlorine |
| Filter media | Activated carbon block and other filter media |
| Tested full flow rate | 0.75 gallons per minute |
| Suggested replacement interval | Every 6 months or 15,000 gallons, whichever comes first |
| Water connection | Cold water valve only |
What This Replacement Filter Is Designed For
The Waterdrop 3US-MAX-F01 under-sink water filter is made as a replacement for specific Filtrete and related filter models. Compatibility is listed for 3M Filtrete 3US-PF01, 3US-MAX-F01, 3US-PF01H, and 3US-MAX-F01H cartridges. It also fits Filtrete Maximum Filtration, 3US-PS01, and 3US-MAX-S01 systems.
Additional compatible references include 3M HF25, HF25-S, and HF25-MS, along with Manitowoc K-00337, K-00338, K00337, and K00338. The listed compatibility references also include Delta RP78702 and AR10000. Because under-sink filter housings and connections can vary, the model number on the existing cartridge or system should be checked before installation.
Filtration and Water Quality Features
Activated Carbon Filtration
The cartridge uses an activated carbon block along with other filter media. Its stated filtration focus is chlorine reduction, which may be relevant when the goal is to improve the taste or odor associated with chlorinated tap water. Chlorine reduction is not the same as complete purification, so the filter should be selected according to the specific substances a household needs to address.
The filter does not reduce TDS. TDS refers to the total amount of dissolved substances measured in water. A cartridge that leaves TDS unchanged is different from a reverse osmosis system or another treatment method designed to lower dissolved solids. This distinction is important for anyone comparing filtration technologies.
Standards and Materials
The filter is tested against NSF/ANSI 42 standards for its stated chlorine-reduction function. The materials are also certified by IAPMO against NSF/ANSI 372, which relates to lead content in drinking water system components. The cartridge is described as BPA-free and lead-free.
These standards and material details provide useful points for comparison, but they do not mean the cartridge addresses every possible water contaminant. Local water conditions, incoming water quality, and the requirements of the existing filtration system should also be considered.
Flow Rate and Replacement Schedule
The tested full flow rate is 0.75 gallons per minute. This describes the rate identified for the replacement under-sink filter under testing conditions. Actual flow at a household faucet can vary because of water pressure, plumbing, the condition of the filter, and the connected filtration system.
The recommended replacement schedule is every 6 months or 15,000 gallons, whichever comes first. Water conditions can affect how long a cartridge performs as intended, so the interval may vary. A filter used with water containing more sediment or a higher level of chlorine may require closer attention than one used under lighter conditions.
Regular replacement helps maintain the intended filtration function and flow. Waiting well beyond the suggested interval can allow the cartridge to become more restricted as filtration media collect material from the water. The cartridge should be changed according to the system’s replacement procedure and any relevant instructions for the installed housing.
Compatibility Checks Before Installation
Compatibility is one of the most important considerations for a replacement cartridge. The listed model references cover several related systems, but a similar-looking filter is not automatically interchangeable. Before removing the existing cartridge, compare its model number with the supported references.
- Check for Filtrete 3US-PF01, 3US-MAX-F01, 3US-PF01H, or 3US-MAX-F01H references.
- Confirm that the existing system is a listed Filtrete Maximum Filtration, 3US-PS01, or 3US-MAX-S01 system.
- Check compatibility with 3M HF25, HF25-S, or HF25-MS where applicable.
- Compare any Manitowoc, Delta, or AR reference numbers with the supported models.
- Confirm that the installation uses a cold water connection only.
If the existing cartridge or housing has a different model reference, additional confirmation may be needed before fitting a replacement. Dimensions, connection details, and installation steps are not specified here, so those details should be checked against the filtration system documentation.
Common Household Uses
This cartridge is intended for use in an existing under-sink water filtration setup connected to a cold water line. It may be used where the household wants filtered water supplied through a compatible faucet or fixture, provided the system is designed for this replacement model.
Because the stated reduction focus is chlorine, it may be suitable for users whose main concern is chlorine-related taste or odor. It should not be treated as a universal solution for all water-quality concerns. Households dealing with a known contaminant should consult local water-quality information and choose filtration equipment certified for that specific concern.
Points to Consider
The main practical advantage of a replacement cartridge is that it allows an existing filtration system to continue operating without replacing the complete housing or installation. However, the benefit depends on correct fit and timely maintenance.
- System fit: Verify the existing model and system reference before installation.
- Cold-water connection: The cartridge is specified for connection to the cold water valve only.
- Filtration scope: The stated reduction is chlorine, and TDS is not reduced.
- Flow expectations: The tested full flow rate is 0.75 gallons per minute, but household conditions can affect actual flow.
- Maintenance: Replace the cartridge every 6 months or 15,000 gallons, with water conditions potentially affecting the interval.
- Installation details: Dimensions, included parts, and step-by-step installation information should be confirmed for the particular system.
Frequently Asked Questions
What does the Waterdrop 3US-MAX-F01 filter reduce?
Its stated filtration function is chlorine reduction. It uses an activated carbon block and other filter media, but it does not reduce TDS.
Which systems does this replacement cartridge fit?
It is listed for Filtrete Maximum Filtration, 3US-PS01, and 3US-MAX-S01 systems. It also references 3M Filtrete 3US-PF01, 3US-MAX-F01, 3US-PF01H, 3US-MAX-F01H, 3M HF25-series filters, Manitowoc K-00337 and K-00338, Delta RP78702, and AR10000.
How often should the cartridge be replaced?
The stated schedule is every 6 months or 15,000 gallons, whichever comes first. Water conditions may affect the practical replacement interval.
Can it be connected to a hot water line?
No. The filter is specified for connection to the cold water valve only.
What is the tested flow rate?
The tested full flow rate is 0.75 gallons per minute. Actual household flow may vary depending on water pressure, plumbing, filter condition, and the connected system.
For the latest product information and specifications, view the current product listing.
Final Thoughts
The Waterdrop 3US-MAX-F01 under-sink water filter is a replacement cartridge for a defined range of Filtrete and related systems. Its key features include chlorine reduction, an activated carbon block, a tested full flow rate of 0.75 gallons per minute, BPA-free and lead-free materials, and compatibility with several specified model references. The most important steps before installation are confirming system compatibility, using the cartridge only with a cold water connection, and following the recommended replacement schedule.