Choosing the Right Water Tank Mixer for Your Potable Water Drinking Water Reservoir: A Comprehensive Guide

Choosing the Right Water Tank Mixer for Your Potable Water Drinking Water Reservoir: A Comprehensive Guide


A suitable water tank mixer is crucial for water treatment operators to maintain good-quality potable water in reservoirs. Well-designed and efficient mixers are integral in preventing issues like poor-tasting water, stratification, stagnation, and the growth of harmful microorganisms. The following comprehensive guide discusses eight essential factors when choosing a water tank mixer for your potable water reservoir.

Water Quality Regulations and Compliance:

Before diving into the technical aspects of mixers, it’s essential to understand the regulatory standards and compliance requirements for potable water. Different states and regions may have specific guidelines and standards set by their lawmakers and agencies, such as the EPA. Ensure that the mixer you choose complies with these standards to maintain the quality and safety of the drinking water. For instance, many states require NSF-61 certification for any water tank mixer that comes in touch with drinking water.

Type of Water Tank Mixer:

Various types of water tank mixers are available in the marketplace, and selecting the right one depends on the size and design of your water reservoir. The three most common types are:

  • Submersible Mixers: These units prevent stratification and maintain consistent water temperature throughout the tank.
  • Top-Entry Mixers: Positioned above the water level, these mixers are suitable for larger reservoirs and can be easily maintained.
  • Side-Entry Mixers: These mixers,, which reside on the side of the reservoir, are efficient in preventing sedimentation and promoting uniform water quality

Reservoir Size and Shape:

The size and shape of your potable water reservoir play a significant role in determining the type and number of mixers needed. Large reservoirs may require a combination of mixers to ensure thorough water circulation. Consider the depth, width, and length when selecting a mixer to achieve uniform water quality.

Energy Efficiency:

Energy efficiency is a critical factor in choosing a mixer. Opt for mixers with variable speed drives that allow you to adjust the mixing intensity based on the water conditions. This will save energy and ensure optimal performance in different scenarios. Look for mixers with energy-efficient motors to minimize operational costs.

Material Compatibility:

The materials used in the mixer’s construction must be compatible with potable water standards. Stainless steel is a common choice due to its corrosion resistance and suitability for drinking water applications. Ensure the materials meet regulatory requirements and not leach harmful substances into the water.

Maintenance and Accessibility:

Regular maintenance is crucial for mixers’s longevity and efficiency. Choose a mixer that is easy to access for routine inspections and repairs. Top-entry mixers, for example, are preferred for their accessibility. 

Control and Monitoring Systems:

Advanced mixers come equipped with control and monitoring systems that allow operators to manage the mixing process effectively. Look for mixers with remote monitoring, automated control, and alarms for abnormal conditions. These systems contribute to the overall reliability and performance.

Installation and Retrofitting:

Consider the ease of installation, especially if you are retrofitting a mixer into an existing reservoir. It is best if the mixer you purchase is easy to maintain, such as not needing to drain the reservoir to access it, minimizing downtime and operational disruptions.


Choosing the suitable water tank mixer for your potable water drinking water reservoir is a decision that directly impacts water quality, compliance with regulations, and operational efficiency. By considering factors such as water quality regulations, mixer type, reservoir size, energy efficiency, material compatibility, maintenance, control systems, and installation, you can make an informed decision that ensures the long-term success of your potable water system. Investing in a high-quality mixer is an investment in the health and well-being of the communities, relying on the safety and reliability of their drinking water supply.