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How to Fix a Cloudy Hot Tub

Having cloudy hot tub water is a common problem. We’ll learn what causes the water to be hazy and then demostrate some simple remedies.

What Causes Cloudy Hot Tub Water?

Causes include:

  • Dead algae particles
  • Debris from the enviroment
  • Bad filtration
  • Lack of sanitizer (i.e. chlorine)
  • High pH and/or alkalinity
  • Vandalism (let’s just hope it’s not vandalism)
  • Body oils, lotions, and other human elements

These are common causes to cloudy water in a hot tub, and unlike a pool, a hot tub can become cloudy quicker because of it’s small size. You’re dealing with a lot less water than a swimming pool.

3 Cures For Cloudy Hot Tub Water

Depending on your situtation, you can use any of these techiques for getting rid of the cloudy, hazy water. If the water in your hot tub is less than 2 months old, then I suggest doing the following…

1. Test Your Hot Tub and Shock It

Before you shock the tub, you need to know what the chemicals levels in your water are.

  • pH is between 7.4 and 7.6
  • Alkalinity is between 100 and 150 ppm (parts per million)

If your water is properly balanced, then you can shock the water depending on the type of sanitizer you use.

[NOTE: When adding any chemicals to your water, be sure the hot tub is running but the air valves (the bubbles) are turned off.]

Testing Hot Tub

How to Test Hot Tub Water Properly

In order to maintain a clean and clear hot tub, you need to lean how to test hot tub water properly and accurately with this simple VIDEO tutorial.

Click here to learn more »

For chlorine or mineral sanitized hot tubs, use powered chlorine and non-chlorine shock. For a 500 gallon hot tub, you would use 3 teaspoons of concentrated, powder chlorine or 2 ounces of non-chlorine shock (potassium peroxymonosulfate). Then let it run for about 20 minutes with the hot tub cover off.

For bromine sanitized hot tubs, use powered bromine and non-chlorine shock. For a 500 gallon hot tub, you would use 2 1/2 ounces of powered bromine or 2 ounces of non-chlorine shock (potassium peroxymonosulfate). Let it run for about 20 minutes with the hot tub cover off.

For BaquaSpa or biguanide sanitized hot tubs, use the same brand of shock designed for your chemical system. The dosages may be different depending on which brand you use.


Hot Tub Chemistry 101

Keeping your hot tub chemistry in check is not only important for your tub, but also for the people in it. Check out our complete guide to hot tub care.

Click here to learn more »

2. Use A Hot Tub Water Clarifier

When choosing a spa water clarifier, make sure the chemical is designed for hot tubs. DO NOT use a water clarifier for a swimming pool. Follow the direction on the back of the bottle when adding clarifier.


3. Drain and Refill

The beauty of owning a hot tub is the ability to easily drain and refill if you have a problem. I would recommend taking this route if you water is more than 2 months old.

drain hot tub

How to Drain and Clean a Hot Tub

You should drain and clean your hot tub every 3 - 4 months. I'll teach you how to drain and clean a hot tub properly with just a few steps.

Click here to learn more »

If you use the hot tub quite a bit, you will need to change out the water frequently. Just think of it like a bath tub in your house. Would you just fill it up once and keep using the same water over and over again? No! That would be totally gross. Change the water in your hot tub!

Happy Soaking!


The Hot Tub Handbook

This Is The Last Hot Tub Manual You Will Ever Need

You'll save at least $100 off the bat with this easy-to-follow digital handbook. This is the guide that hot tub manufacturer doesn’t provide you.

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  • Sally Koeller

    I just added pH to my tub and it instantly went cloudy. All other chemicals (chlorine, alkalinity, calcium) were right on and the water was fresh. How can I clear it up? Thanks

  • Matt Giovanisci

    It should clear up on its own. You need to add the chemicals slowly and over time so that doesn’t happen again.