How To Get Rid Of Algae In A Hot Tub?


If you have come to find that there is algae in your hot tub, it’s important to remove it as soon as possible. There are a few recommended steps to follow when doing so. These steps include the following:

  • First, start off by scrubbing the algae or mold off the tub and vacuum all that is brought to the surface. 
  • Empty all the water from your tub
  • Clean the shell of your hot tub, and all other parts of your hot tub. 
  • Sanitize the filters so that there is no algae left over
  • Refill your hot tub with water from the hose and heat it to the wanted temperature
  • Check the pH levels of your water, and adjust pH and alkalinity to ensure its balanced
  • Using a recommended solution, you can then shock the water
  • Following this, you can treat your spa to a super-resistant algae algaecide
  • Test the water hardness again, looking at pH levels and total alkalinity

After performing this last step, your hot tub should be ready for use. If your levels test correct and within the recommended amounts, your hot is free for use! 

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What causes green algae in hot tubs?

There are many various causes of green algae in your hot tub. The most common cause of green algae in your hot tub is due to imbalances in the water. These imbalances can occur due to fluctuating levels of pH or from not having enough sanitation chemicals. 

Sanitation chemicals include brome and chlorine, and having the proper amounts of these chemicals can ensure a safe and clean hot tub. If your tub is experiencing any of these imbalances, then green algae will appear. 

Why am I getting algae in my hot tub?

Basic algae is very common to find in some hot tubs that are lacking the proper cleaning solutions or in hot tubs that are left uncovered in the sunlight. Leaving your hot tub in the direct sun, with no covering for longer periods of time encourages algae growth. 

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Can you go in a hot tub with algae?

This is a question that many will have different viewpoints on. Nevertheless, it has yet to be scientifically proven that hot tubs should be off-limits when there is green algae in them, its not necessarily recommended. You are able to swim in hot tubs that have algae because it’s not dangerous to humans. 

However, it’s usually advisable not to take a dip. Likely, your hot tub will need to be cleaned and shocked to get rid of the algae. Once this has been done, your hot tub will look as good as new. After shocking your hot tub, it’s recommended to wait over 24 hours before entering due to the harsh cleaning solutions that are used.


  • Jason

    Jason is an experienced writer, having contributed to many popular websites over the years. He currently writes for Big Hot Tub, a blog about everything hot tubs. When he's not writing or working on his blog, Jason enjoys spending time with his wife and two young children.