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Water storage tanks are held to certain standards and are required to meet certain regulatory requirements. One of the best ways to ensure the quality of the water within a water storage tank is up to standard is by incorporating a water storage tank mixer. An active storage tank mixer allows for the water within the tank to provide accurate readings during sampling to guarantee the highest water quality is being provided. 

Sampling can often result in inaccurate readings due to many reasons including tank design and manual mixing practices, but a tank mixer helps aid in water quality consistency. Installing a storage tank mixer can also help keep thermal stratification to a minimum which can help the tank stay clean and water quality optimal.


As water sits in a water tank it may offer different readings when it comes to the sampling of the distribution system. One sample may come back with positive results of a free chlorine residual and another may indicate no coliform bacteria. Even when these tests are conducted back to back, results still may show inconsistencies. Sometimes, even taste tests of the water may not be consistent. One day a sample may taste completely fine, and the next have a slightly sulfuric taste. 

Water quality is a serious matter, and shouldn’t be taken lightly. Ensuring water from groundwater wells and surface water exiting treatment facilities is up to standard is extremely important. That’s why understanding  the consistency of water samples is directly correlated to the water distribution within the storage tanks. What this means is samples taken from the tank directly relate to the quality of water being provided to the homes within the community. If the water within the tank isn’t evenly distributed, samples will prove inconsistent.


There are three main factors that play a role in water sample inconsistencies: manual mixing, the use of re-circulation pumps, overall tank design, and chemical separation.

  • Manual Mixing
  • Tank Design
  • Chemical Separation

Water storage tank mixers work by continuously mixing the water within the tank, generating water samples that should be consistent no matter where the sample is taken from within the tank.


Many studies have shown thermal stratification can occur in as little as four hours. Even more alarming, the difference of one degree, less or more, can create layers within the stored water. As mentioned above, these changes in water temperatures can cause chlorine decay as water ages more quickly near the surface of the tank.


Have you ever stepped into a body of water and noticed it may feel warmer near the surface but colder the deeper you get?

If so, you’ve experienced thermal stratification first hand. As with all bodies of water, water stored within a storage tank experiences thermal stratification. Now what does this mean as far as water quality is concerned? The answer is this: higher water temperatures correlate with higher residual disinfectant loss and higher biological growth. Simply put, warmer surface temperatures break down disinfectant chemicals such as chlorine, and can lead to bacterial growth at a much higher rate.

Thermal stratification prevents new, fresher water from mixing with old water. The warm unmixed water in the top of your tank can be trapped for days. This water loses its residual disinfectant and grows disinfection byproducts (DBP’s), compromising the overall water quality. As seasons change, so do temperature layers. In the warmer, summer months, the top layer of water is the warmest, while the temperature cools the deeper you go. The opposite is true during winter months. The top layer of water may form ice on the surface as the water below remains at a higher temperature. Different temperature layers form due to the molecular nature of water. Warm water contains molecules that are less dense, therefore sit atop of colder molecules. As the sun raises the internal temperature of the tank, water molecules that have warmed will create a warmer layer near the surface. Between the different temperature layers is a transition layer known as the thermocline.

Do You Know The
Quality Of The Water In Your Tank?

The Blue Fusion Advantage

The patented design continuously blends the cooler water from the bottom of the tank through the thermocline and into the warmer water above. This process decreases water age and DBP formation.

With blended water from the blue fusion mixing system, the thermocline is eliminated through mixing all water inside the tank, reducing DBP’s and improving overall water quality.


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There two main types of tank mixing systems that work to break up thermal stratification: active and passive. Active mixing systems operate 24/7, while passive mixing systems only operate when water is flowing into the tank (passive systems need water pressure to function). 

When looking to choose which mixing system would work best for the tank in question, it’s important to note the fill cycle of the tank. Fill cycles should be longer than mixing cycles; if the water is set to fill every 3 hours, the mixer should be able to complete a mixing cycle in under 3 hours. 

Costs are another factor to consider. Purchase cost, repair costs, and power costs should be taken into consideration, as well as ease of installation and any warranties it may come with. 

Lastly, motor bearing life will determine the lifespan of your mixing system. Some systems are  built to last at least 20 years or for 200,000 hours, while others have a shorter life.

How to Eliminate
this Problem?

Install a mixing system that proactively:

  • Limits water age

  • Lowers water temperature

  • Limits deterioration of disinfectant
    chemicals –which leads to disinfection byproducts.

  • Raises water quality throughout the entire tank (including upper part of tank)


Blue Fusion pumps are accessible 24/7 at the exterior base of the tank. The system can be repaired while the tank remains in service.


Cool n’ Clean


Our Resolved Analytics

Report About our Tank Cleaning System

Using Computational Fluid Dynamics

Our device mixes by both moving cold water to the top of the tank and by
creating water circulation patterns within the reservoir. It has the further advantage of aerating the water due to splashing when the tank level is less than 100% capacity.

The Blue Fusion design has been verified to be an efficient thermal mixer and aerator of small to large water tanks.

The Blue Fusion system provides THM reduction through aeration that on-market devices do not provide. Run continuously, THM levels should be reduced by more than 50%.


The Blue Fusion design has been verified to be an efficient thermal mixer and aerator of large municipal water tanks.

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After 4 hours, 77% of the tank has been aerated to >1% saturation. Download report and see how awesome we are.

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