Does Salt Kill Algae in a Pool? An In-depth Look at Saltwater Pool Maintenance

Algae is a common problem when it comes to pool maintenance. The microscopic organism can quickly grow, leading to a dirty, slimy, and uninviting pool. While there are various ways to combat algae, many pool owners are turning to saltwater pools as a solution. In this article, we’re going to explore the effectiveness of saltwater pools in combatting algae and delve into proper saltwater pool maintenance.

Does salt kill algae in a pool? The short answer is yes, but it’s not as simple as you might think. Saltwater pools use a process called electrolysis to produce chlorine, which in turn kills algae. However, the focus should be on maintaining chlorine levels, rather than simply relying on salt alone.

Stay with us as we dive into the world of saltwater pools, their benefits, potential drawbacks, and everything you need to know to properly maintain a saltwater pool and keep algae at bay.

Understanding Saltwater Pools

Saltwater pools use a salt-chlorine generator to produce chlorine from salt. While these pools still use chlorine to sanitize the water and kill algae, the method of generating chlorine is different than that of traditional chlorinated pools.

How Salt-Chlorine Generators Work

Salt-chlorine generators consist of a salt cell and a control board. The salt cell has metal plates through which the pool water passes. As saltwater passes through the cell, an electric current is applied, which causes a chemical reaction called electrolysis.

  1. Electrolysis breaks down the salt (sodium chloride) molecules into its separate components.
  2. This process generates chlorine gas, which effectively disinfects the water and kills algae.
  3. The chlorine gas quickly dissolves in the water, forming hypochlorous acid (the active form of chlorine) and sodium hydroxide.
  4. Hypochlorous acid kills algae and other microorganisms, oxidizes debris, and sanitizes the water.
  5. Sodium hydroxide raises the water’s pH slightly.
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Benefits of Saltwater Pools

There are several benefits to having a saltwater pool, including:

  • Lower chlorine levels: Saltwater pools generally have lower chlorine levels than traditionally chlorinated pools, making the water gentler on the skin and eyes.
  • Reduced maintenance: Saltwater pools require less maintenance compared to traditional chlorinated pools, as the salt-chlorine generator continually produces chlorine.
  • Cost savings: While the upfront cost for a salt-chlorine generator is high, long-term savings can be realized as there is no need to purchase and store additional chlorine products.
  • Better water quality: Many pool owners report that the water in saltwater pools feels softer and less abrasive compared to traditional pools.

Maintaining a Saltwater Pool

Proper maintenance is essential to keep your saltwater pool algae-free. Here are some key maintenance tasks to ensure optimal water quality and minimize the risk of algae growth.

Regularly Test Water Chemistry

  1. Check chlorine levels: The active chlorine concentration should be between 1 and 3 parts per million (ppm).
  2. Test pH levels: Keep the pH in the range of 7.2 to 7.8 for optimal chlorine effectiveness and to prevent scale formation.
  3. Check alkalinity: Maintain alkalinity levels in the range of 80 to 120 ppm to help stabilize pH and prevent rapid fluctuations.
  4. Test stabilizer (cyanuric acid) levels: Proper stabilizer levels (30 to 80 ppm) help protect the chlorine from UV degradation, ensuring it stays effective longer.

Regular Cleaning and Maintenance

  1. Use a pool skimmer to remove debris and leaves from the water’s surface.
  2. Brush the pool walls, floor, and steps regularly to prevent algae buildup.
  3. Regularly inspect the salt cell for buildup, as scaling can reduce its effectiveness. Clean it according to the manufacturer’s instructions.
  4. Run your pool pump and filter for at least 8 to 12 hours per day to ensure proper circulation and filtration.
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Preventing and Treating Algae Growth in a Saltwater Pool

  1. Maintain proper water chemistry.
  2. Regularly shock the pool water to eliminate any lingering algae spores.
  3. Consider using an algaecide as a preventive measure.
  4. If algae is visible, use a pool vacuum to remove dead algae after treatment.


  • Can algae grow in a saltwater pool?
    • Yes, algae can grow in a saltwater pool if proper maintenance isn’t performed and water chemistry is not properly balanced.
  • Are saltwater pools more resistant to algae growth?
    • The consistent generation of chlorine makes saltwater pools less susceptible to algae growth compared to traditionally chlorinated pools.
  • Can salt alone kill algae?
    • Salt alone cannot kill algae, but the electrolysis process generates chlorine, which effectively kills algae.
  • What other factors can contribute to algae growth in a pool?
    • Warm temperatures, lack of circulation, low sanitizer levels, an imbalance in water chemistry, and excessive debris can all lead to algae growth.


Saltwater pools are an effective solution for many pool owners seeking a more comfortable and low-maintenance swimming experience. While salt does help in killing algae by generating chlorine through electrolysis, maintaining proper water chemistry and regular cleaning is crucial to ensuring an algae-free pool. With the right maintenance regimen, you can enjoy the benefits of a saltwater pool and keep those pesky algae at bay.

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