How Does the Aqua Pure Water Filtration System Work?

Access to clean drinking water is crucial for our health and well-being. A water filtration system helps purify water by removing impurities, improving taste, and ensuring safety. The Aqua Pure water filtration system 3M is a line of products designed to deliver cleaner, more precise, and better-tasting drinking water.

This system includes various models, such as under-sink dedicated faucet units, separate faucet systems, and whole-house filtration options. It utilizes multi-stage filtration to reduce contaminants such as particulates, chlorine taste and odor, sediments, and hard water scale buildup.

Filtration Stages

Multi-Stage Filtration Process

The Aqua Pure water filtration system employs a multi-stage filtration process to remove various contaminants from your drinking water effectively. This comprehensive approach ensures that your water is thoroughly purified, resulting in better taste and improved quality.

  1. Sediment Removal The first stage of filtration targets larger particles, such as sediment, dirt, and rust. A 0.2 or 0.5 micron filter traps these impurities, preventing them from entering your drinking water.
  2. Chlorine and Odor Reduction Chlorine is commonly added to municipal water supplies to disinfect and eliminate harmful bacteria. However, it can leave an unpleasant taste and odor in your water. The Aqua Pure system utilizes specialized filters to reduce chlorine levels, improving your drinking water's overall taste and smell.
  3. Lead and Contaminant Reduction Certain models, like the 3MFF100 Lead Reduction Drinking Water System, are designed to significantly reduce contaminants such as lead, benzene, and p-dichlorobenzene. These filters ensure that your water is free from harmful substances, providing you with a safer and healthier drinking experience.
  4. Reverse Osmosis (RO) Filtration For those seeking the highest level of purification, the Aqua Pure reverse osmosis system offers a four-stage filtration process. This advanced technology removes a wide range of impurities, including dissolved solids, heavy metals, and microscopic particles, delivering clean, purified water directly to your tap.

Filter Model & Key Features

Under-sink Dedicated Faucet - NSF certified to reduce particulates, chlorine taste/odor, and other contaminants

Full Flow Drinking Water Systems - 0.2 or 0.5 micron filtration for sediment, chlorine, and impurity reduction

Reverse Osmosis System - 4-stage filtration process for comprehensive purification

3MFF100 Lead Reduction System - Reduces particulates, chlorine taste/odor, cysts, lead, benzene, and p-Dichlorobenzene

Utilizing this multi-stage filtration approach, the Aqua Pure water filtration system ensures that your drinking water is free from various contaminants, providing a safe, great-tasting, and refreshing water supply.

Installation and Setup

Preparation and Location

Before installing the Aqua Pure water filtration system, it's crucial to determine the appropriate location and prepare the area. The system should be installed as close to the water supply source and a drain, preferably before the water heater. Ensure that the chosen location is not susceptible to freezing temperatures.

Installation Steps

1. Shut Off the Water Supply and Depressurize Lines

  •  Turn off the main water supply and depressurize/drain the plumbing lines.
  •  For water heaters, shut off the fuel or electric power before installation.

2. Install Feed Water Valve and Tubing

  •  Install the feed water valve and connect the necessary tubing.

3. Prepare and Install Storage Tank

  •  Prefill and sanitize the storage tank according to the manufacturer's instructions.
  •  Install the drain connection for the storage tank.

4. Mount Faucet and Make Connections

  •  Create a mounting hole for the faucet, if required.
  •  Mount the faucet and make the initial tubing connections.

5. Install Purification Assembly

  •  Using the provided components and PTFE tape for sealing, assemble the filter head, cartridges, and any optional bypass systems.
  •  Mount the purification assembly and storage tank using the supplied brackets or pipe hangers.

6. Make Final Tubing Connections

  •  Connect the remaining tubing between the purification assembly, storage tank, and faucet.

7. Install Optional Icemaker Hookup

  •  If desired, install the icemaker hookup according to the manufacturer's instructions.

8. Install Filter Cartridges

  • Install the appropriate filter cartridges into the filter head, ensuring correct positioning.

9. Start Up the System

  • Turn the main water supply back on and flush the system for at least 10 gallons before use.
  • Restore fuel or electric power to the water heater.

Additional Considerations

  •  Consult the product manual for installation instructions and follow all local plumbing codes.
  •  Installation may require additional tools and fittings beyond what is provided with the system.
  •  For city water, install the system after the water meter; for well water, install it after the pressure tank.
  •  Flush the system thoroughly before use, as recommended by the manufacturer.
  •  Replace filter cartridges and components according to the recommended schedule or when the flow rate decreases.

Operation and Maintenance

Regular Maintenance

Proper maintenance ensures the Aqua Pure water filtration system operates at peak performance and provides clean, safe drinking water. Follow these guidelines for optimal operation:

1. Filter Cartridge Replacement

  •  Replace the prefilter and postfilter cartridges every 6 to 12 months or sooner if the flow rate decreases significantly.
  •  Replace the reverse osmosis (RO) membrane module every 18 to 36 months or as indicated by an optional percent rejection monitor

2. System Sanitization

  • Sanitize the storage tank upon initial startup, after any servicing or maintenance, and routinely as the manufacturer recommends
  • For RO systems, sanitize the assembly by injecting a bleach solution into the filter cartridges before installation

3. Water Pressure Requirements

  • Ensure a minimum water pressure of 20 psi (138 kPa) at the filter tank inlet.
  • If the water pressure exceeds 80 psi (552 kPa), install a pressure-reducing valve to prevent damage.
  • The maximum allowable water pressure varies by model, typically ranging from 100 to 125 psi (689 to 862 kPa).

4. Temperature Considerations

  • Protect the system from freezing temperatures by draining the filter when temperatures drop below 40°F (4.4°C).

 Additional Maintenance

  • For time clock or meter-initiated models, adjust the regeneration frequency or program wheel based on water hardness and household size.
  • Replace the activated carbon media if the taste or odor reappears or if the pressure drop becomes excessive.
  • Replenish calcite media at least annually.


In case of issues, consult the troubleshooting guide provided by the manufacturer. Common problems may include:


  •  Hard water
  •  High liquid level in the brine tank
  •  Incorrect regeneration time
  •  Water leaks
  •  Noise in the drain
  •  Low water production

Issue and Potential Solution


  • Hard water - Check regeneration settings, salt levels, and media condition
  • High brine tank level - Check for obstructions in the brine line or faulty components
  • Incorrect regeneration time - Adjust the time clock or program wheel settings
  • Water leaks - Inspect connections, fittings, and components for leaks
  • Noise in the drain - Check for proper drain line installation and air gaps
  • Low water production - Replace filters, check water pressure, and inspect for clogs

Failure to follow the manufacturer's instructions and recommended maintenance schedule may void the warranty. Regular maintenance and prompt troubleshooting ensure the Aqua Pure water filtration system continues to provide clean, great-tasting water for your household.


The Aqua Pure water filtration system 3M models effectively improve the quality and taste of your drinking water. Utilizing a multi-stage filtration process removes various contaminants, including sediments, chlorine, lead, and other impurities, ensuring that you and your family have access to clean and safe water. With proper installation and regular maintenance, this system can provide years of reliable service, giving you peace of mind about the water you consume.

Investing in a water filtration system like Aqua Pure is a wise decision for anyone seeking to enhance their water quality and promote a healthier lifestyle. By taking advantage of the advanced filtration technology offered by 3M, you can enjoy the convenience of having clean, great-tasting water directly from your tap, without the need for bottled water or constant filter replacements. Embrace the benefits of pure, refreshing water and make the Aqua Pure system a part of your home today.