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Why Do Hot Tubs Go Green? Spa Water Fixes

Do you ever wonder why hot tubs turn green and murky? Hot tubs are usually a pristine blue-colored body of water, which begs the question: what causes it to turn green? Hot tubs go green due to chemical imbalances and bacteria infestations in the spa water, which can be remedied with proper water care and maintenance. In this article, we’ll uncover the causes, preventive measures, and how to fix a green hot tub.

What Causes Hot Tub Water To Become Green?

The most common cause of green or cloudy hot tub water is an imbalance of chemicals and bacteria, with too much bacteria and not enough sanitizer present in the spa. These imbalances can occur for a variety of reasons, such as not properly testing and balancing the pH and alkalinity of your spa water, using too much chlorine, or not showering before using the spa.

Chemical Imbalance

When spas are not properly maintained, the levels of alkalinity, pH and chlorine can become unbalanced. pH levels that are too low or high can cause the water in your spa to become cloudy, while over chlorination can cause an increase in chlorine levels, leading to green water.


Another common cause of a green hot tub is bacteria growth. Bacteria grow rapidly in warm, humid environments like hot tubs, and can lead to cloudy, green water. These bacteria can form due to a lack of chlorine, which is the primary sanitizing agent in hot tubs, as well as from sweat, lotions, or improper maintenance.

Preventative Measures for Maintaining Clear Hot Tub Water

Fortunately, there are a few simple ways to keep your hot tub clean and free of bacteria, so you can continue to enjoy your spa experience.

Proper Balancing and Cleaning of Water

First, ensure the pH and alkalinity of your hot tub is tested and balanced regularly. Keeping the water’s pH and alkalinity balanced is crucial for preventing bacterial growth and cloudy water. In addition, using the right amount of chlorine to sanitize your spa is important.

Proper Hygiene Practices

It is also important to make sure you are showering before using the spa, and not using lotion, sunscreen, cosmetics, or other products while in the hot tub. This will help prevent bacteria growth, as well as reduce the risk of staining or yellowing of the water.

Fixing a Green Hot Tub

When it comes to fixing a green hot tub, there are a few steps that must be taken.

Test and Balance the Water

The first step is to test and balance the pH and alkalinity of the hot tub water. It is important to make sure the pH is between 7.2 and 7.6 and the alkalinity is between 80 ppm and 120 ppm.

Shock the Water

After the water is balanced, shock the hot tub with a non-chlorine shock. This will oxidize any remaining bacteria and organic contaminants, restoring the water back to its clear and crisp state.

Regular Maintenance

Once the hot tub is returned back to its normal state, it is important to keep up with your regular water maintenance. Make sure to use the right amount of chlorine, test the water on a regular basis, and thoroughly clean the hot tub on a weekly basis.

People Also Ask

What Can I Do if My Hot Tub is Cloudy and Smells?

If your hot tub is cloudy and smells, balance the water, shock the water with a non-chlorine shock, and thoroughly clean the hot tub.

Can I Use Chemical Cleaners to Clean My Hot Tub?

Chemical cleaners are not recommended for cleaning your hot tub, as these cleaners can be too harsh and can damage the finish of the spa. Instead, use a mild cleaning solution and a soft cloth.

How Often Should I Test My Hot Tub Water?

It is best to test your hot tub water each week to ensure the pH and alkalinity levels remain balanced.

How Often Do I Need to Clean My Hot Tub?

It is best to clean your hot tub on a weekly basis.

Final Words

Green and cloudy water in hot tubs is a common problem, but one that is easily avoidable with regular water care and maintenance. By testing and balancing your pH and alkalinity, adding the correct dose of chlorine, and cleaning regularly, you can enjoy crystal clear hot tub water.