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Why Salt Water Isn't the Best Choice for Hot Tubs


Salt Water Explained Eco Spa Blog
Salt Water Generation

Introduction: In the realm of hot tubs, the allure of saltwater as an alternative sanitation method has garnered significant attention in recent years. Proponents champion saltwater's supposed benefits, citing its gentleness on the skin, ease of maintenance, and overall bathing experience. However, beneath the surface lies a myriad of hidden dangers and drawbacks that can compromise the health, longevity, and enjoyment of your hot tub experience. In this comprehensive analysis, we delve into the harsh realities of saltwater hot tubs and why they may not be the best choice for discerning consumers.


Understanding How Saltwater Hot Tubs Work:


Saltwater hot tubs operate on a principle similar to that of saltwater pools, employing a process known as electrolysis to produce chlorine for sanitation. Here's a closer look at how they work:


  1. Salt Chlorine Generator (SCG): At the heart of a saltwater hot tub is the salt chlorine generator (SCG). This device consists of a cell containing electrically charged plates, typically made of titanium or other corrosion-resistant materials. As the saltwater passes through the cell, an electrical current is applied, causing electrolysis to occur.

  2. Electrolysis Process: During electrolysis, the sodium chloride (salt) in the water is broken down into its component parts: sodium ions (Na+) and chloride ions (Cl-). These ions then react with the water to form hypochlorous acid (HOCl), a powerful sanitizer that effectively kills bacteria, algae, and other contaminants in the water.

  3. Sanitizing the Water: The hypochlorous acid produced through electrolysis acts as the primary sanitizer in the hot tub, effectively killing bacteria and maintaining water quality. Unlike traditional chlorine-treated hot tubs, which require manual addition of chlorine or chlorine tablets, saltwater hot tubs produce chlorine on-site, eliminating the need for frequent chemical additions.

  4. Salt Concentration: To maintain proper sanitation levels, saltwater hot tubs require a specific concentration of salt in the water, typically around 2500-4000 parts per million (ppm). This salt concentration is achieved by adding salt to the hot tub water and allowing it to dissolve.

  5. pH and Alkalinity Regulation: In addition to producing chlorine, saltwater hot tubs also require regular monitoring and adjustment of pH and alkalinity levels to ensure balanced water chemistry. This typically involves testing the water regularly and adding pH and alkalinity adjusters as needed to maintain optimal levels.


Problems with Saltwater Hot Tubs:


While saltwater hot tubs offer the convenience of on-site chlorine generation and may require fewer chemical additions than traditional hot tubs, they come with their fair share of challenges and drawbacks:


  1. Corrosion Concerns: One of the most significant issues with saltwater hot tubs is the risk of corrosion. The corrosive nature of salt, combined with the heat and moisture present in a hot tub environment, can accelerate the deterioration of metal components, seals, and surfaces. Over time, this corrosion can lead to structural damage, leaks, and costly repairs, compromising the integrity of the hot tub.

  2. Maintenance Hassles: Despite claims of being low-maintenance, saltwater hot tubs require regular monitoring, calibration, and cleaning to maintain optimal performance. From balancing salinity levels to cleaning salt deposits and calibrating the salt chlorine generator, the list of maintenance tasks can quickly become overwhelming for hot tub owners, detracting from the overall enjoyment of the hot tub experience.

  3. Skin and Eye Irritation: While proponents claim that saltwater hot tubs are gentler on the skin and eyes, the reality is that they can still cause irritation for some users. The high salinity of the water can strip the skin of its natural oils, leaving it dry, itchy, and irritated. Additionally, the chlorine produced by the salt chlorine generator can lead to skin and eye irritation, especially if not properly balanced.

  4. Environmental Impact: Beyond the confines of your backyard, saltwater hot tubs can have a significant environmental impact. The disposal of saltwater can contaminate nearby water sources and ecosystems, posing a threat to aquatic life and fragile ecosystems. Additionally, the energy consumption required to operate the salt chlorine generator contributes to carbon emissions and environmental degradation.

  5. Chemical Dependency: Despite claims of being chemical-free, saltwater hot tubs perpetuate a dependency on chlorine for sanitation. While they may require fewer chemical additions than traditional hot tubs, they still rely on chlorine to sanitize the water. This ongoing reliance on chemicals perpetuates harmful environmental practices and exposes users to potential health risks.

  6. Excessive Salt Usage: An often overlooked drawback of saltwater hot tubs is the significant amount of salt required to maintain proper sanitation levels. Unlike traditional chlorine-treated hot tubs, which require periodic addition of chlorine or chlorine tablets, saltwater hot tubs rely on a continuous supply of salt to produce chlorine through electrolysis. This means that hot tub owners must regularly add large quantities of salt to the water to maintain the desired salinity levels, which can be both costly and time-consuming. Additionally, the high salt concentration in the water can lead to corrosion of metal components and surfaces, exacerbating existing corrosion concerns.


While saltwater hot tubs offer the convenience of on-site chlorine generation and may require fewer chemical additions than traditional hot tubs, they come with their fair share of challenges and drawbacks. From corrosion concerns and maintenance hassles to skin and eye irritation, environmental impact, chemical dependency, and excessive salt usage, the pitfalls of saltwater hot tubs must be carefully considered before making a decision. As discerning consumers, it's essential to weigh the pros and cons and explore alternative sanitation methods that prioritize health, longevity, and sustainability.

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