How To Get Rid Of Black Mold In A Hot Tub? Step-By-Step Guide

Helen Skeates
Helen Skeates
26 min read

To begin the process of removing black mold from a hot tub, you must first determine the scope of the problem. You’ll learn how to eliminate black mold from your own home in this essay on mold removal.

In addition, you’ll discover why black mold grows. This would give you an idea of things to look out for when it comes to mold prevention.


What You Need To Know About Mold and Algae in a Hot Tub

Algae normally does not form in a hot tub when it is properly maintained and cared for. The problem is that algae can quickly spread in a heated tube.

How to Get Rid of Algae, Mold and Mildew in Your Hot tub

Proper management of a commercial hot tub is laid out by the CDC. You can also apply these strategies in a more personal setting, such as your home or office.

We’ll go over a few facts about green hot tub water, black and white mold, and algae in the following paragraphs. “Are Mold and Algae in Hot Tub Dangerous?” is a common question among spa owners.

Hot Tub Algae

The first step in dealing with algae is figuring out what kind you have. In hot tubs, algae can be seen in a variety of colors.

Is algae in hot tub dangerous?

In most cases, algae growth in hot tubs isn’t harmful to people.

Is green hot tub water dangerous?

There are a wide variety of green algae, and they are one of the most common and easy to treat. The presence of green algae in your water indicates the presence of metal or a chemical imbalance. Algae of the green coloration grow the fastest and bloom most rapidly, often in the course of a single day.

Use a pre-filter on your garden hose to remove any metallic contaminants from your hot tub water if you have green algae. You don’t have to worry about making adjustments to your hot tub if you use a pre-filter.

Is it safe to go in green hot tub water?

You can swim in the green water of a hot tub. Algae buildup or copper impurities can cause hot tub water to become green. If the water in your hot tub is turning green because of algae growth, try a shock treatment or adjusting the pH and alkalinity of the water. Hair can turn green if the coloring is caused by copper, but it is not hazardous. If a shock treatment and chlorine addition do not remove the copper contaminants, a pre-filter on your garden hose may be your best bet.

Hot Tub Mold

Mold in hot tubs can appear in a wide range of colors and textures. It’s not uncommon to find white, pink, or black flakes among the molds that grow in heated tubes. These molds thrive in hot, humid, and dark settings, so your hot tub is the ideal environment for them to thrive.

Is black mold in hot tub dangerous?

Anywhere along the water’s edge that has been exposed to black mold might expect to find it. There is a chemical imbalance and a lack of water sanitation that causes black mold.

It’s safe for humans to come into contact with black mold. However, it has unattractive and offensive odor. The hot tub cover is the most likely site for black mold to grow, so be sure to thoroughly clean it.

Is white mold in hot tub dangerous?

It’s not uncommon for a white mold to form on the inside of a hot tub’s piping or garden hoses. White mold, like black mold, is not harmful to people, but it is a nuisance. Remove white mold by draining the tub, washing thoroughly and changing the air filters.

Black Mold In Hot Tubs

This sort of mold is known as black mold. Many components of the house, including your hot tub, are ruined by it.

You may learn more about it by reading this article.

What is black mold?

To begin, it’s important to define black mold. There are a number of different types of black mold, but the most prevalent is Stachybotrys chartarum, which is often greenish-black.

All types of black mold aren’t dangerous. Toxic strains of mold, on the other hand, produce mycotoxins that are harmful to people.

Mycotoxins can cause everything from poisoning to a weakness in the immune system. This makes them much more harmful because of the risk of ingesting them, as they prefer to develop on food.

This essay, on the other hand, will focus on the formation of black mold in hot tubs, which might disrupt your relaxation.

How does black mold grow in hot tubs?

The formation of black mold in hot tubs follows the same pattern as that of other types of mold. They must meet a series of requirements before they may thrive and spread.

However, it’s not that tough for them to meet the requirements. Mold can grow more easily on hot tubs since they are a source of constant moisture.

Your bathroom’s wet conditions are the primary cause of the mold you notice growing there on a regular basis. One of the other requirements for mold is nourishment.

Wood, drywall and dust are just some of the things mold thrives on. In order to eliminate mold, you’ll need to deal with the extra moisture in your home.

Here’s an article about removing mold spores that may be useful in preventing them from adhering to your surfaces.

What are the causes of black mold growth in hot tubs?

Black mold can grow for a variety of reasons, not the least of which are:


In a wide variety of temperatures, mold may live. They prefer temperatures of around 73 degrees Fahrenheit.

Mold can be killed by raising or lowering temperatures. This article about the temperature at which food mold is killed by heat may help you learn more about the subject.

Minimal light and sealing issues

As long as there is excess moisture in your hot tub, mold will flourish. It’s more worse if you have a damaged seal on one side of the tub and a plumbing problem on the other.

What are the effects of black mold?

In the following section, we’ll discuss the various causes of black mold and its effects. Black mold is well-known among homeowners, and for good reason.

It is difficult to deal with black mold since it tends to grow and colonize quickly, making it difficult to remove it. In addition, it can cause health issues.

Your family may be exposed to black mold on the hot tub because the bathroom is a communal environment. Black mold is well-known to cause a wide range of health concerns, from short-term allergies to more serious, long-term health issues.

Black mold, in addition to causing health problems, weakens the construction of a home. In addition to destroying the area they choose to reside in, they also deplete the food supply there.

Removing Black Mold In A Hot Tub

We’ve established that black mold is harmful to have in a household, hence why you should eliminate black mold as soon as possible. Here are the steps in removing black mold in a hot tub.

Step #1. Dry your hot tub

We’ve established that black mold is harmful to have in a household, hence why you should eliminate black mold as soon as possible. Here are the steps in removing black mold in a hot tub.

Because black mold is dangerous to have in your home, you should get rid of it as soon as possible. To get rid of black mold from your hot tub, follow these simple procedures.

Step #2. Bleach solution

When it comes to dealing with black mold, bleach is the ideal substance to use. Wear safety goggles and rubber gloves before beginning to prepare the mixture.

Afterwards, mix bleach and water in a spray bottle and spray it over the surface to be cleaned. Spray the hot tub with a mixture of bleach and water to kill the mold.

Step #3. Scrub

Using a plastic brush, clean the tub after it has been sprayed with the bleach-water solution Then, flush the hot tub with clean water, but don’t overdo it.

Check to see if any mold spots remain. Repeat steps two and three if mold is still a problem.

After removing all the mold stains from the hot tub, dry it well. Make sure there isn’t too much dampness in the restroom.

How To Clean Mold From Inflatable Hot Tubs In 7 Steps

There’s something wrong with your hot tub if it’s stinky, if the water is cloudy, or if white or black debris is floating or growing in it. You may have mold, algae, or mildew growing in it, as well as all three at the same time If you see any of these symptoms in your hot tub, it’s time to get it fixed. All three of your hot tubs may be cleaned in the same way. A thorough cleaning of your hot tub and cover is needed if you’re experiencing a problem with the growth of unwanted organisms.

Step 1 – Figure out whether you have mold, mildew or algae in your hot tub

Algae, fungus, and mildew are all distinct types of organisms. Your hot tub has a variety of issues that can cause it to leak. Using the wrong cleaning and chemical products can cause all three of these issues. In your hot tub, how can you know which kind of algae are flourishing?


Black or white mold is the most common color. Surface mold and water mold are both types of fungus that can grow. On the hot tub’s exterior or within its jets, mold will appear as white or black spots growing. It’s also possible that it’s just white things in the water. Mold grows in hot tubs because people’s lotions and soaps dissolved into the water when they entered the tub. Mold can create health problems if it is inhaled. Mold removal should begin as soon as you become aware of its presence in your home.

A wide range of health issues can be caused by mold exposure. These include coughing, wheezing, asthma responses, and even pneumonia, according to the CDC. More information on mold can be found here.

How to Get Rid of Algae, Mold, and Mildew in Your Hot Tub | Hot Spring Spas


Fungus can also take the form of mildew. If you have mildew on your hot tub shell or cover, you will typically see black dots on the surface. On the surface, mildew can be wiped away using a sponge. In locations with high humidity and warmth, mildew thrives. Showers and baths are frequent places for mildew to grow since they are humid and warm.


It is a plant, not a bacterium, that algae is. Your hot tub’s water is a breeding ground for algae. It’s possible for algae to develop in the water or on surfaces beneath the surface of the water. Green, brown, yellow, purple, and even black are all possible colors for algae. Algae can cause your hot tub water to become discolored. You may notice that the walls of your hot tub are covered in slime from algae. Hot tub algae can be caused by an imbalanced PH level and unclean water. In sunshine, algae grows more quickly. If your hot tub is frequently exposed to the elements, it will quickly develop algae.

Step 2 – Shock your tub with sanitizer

Electricity has nothing to do with shocking your hot tub. Your hot tub water might become contaminated with bacteria if you don’t shock it on a regular basis. Mold and algae thrive in warm, stagnant water, which bacteria and organic matter provide an ideal breeding ground for. A pool or hot tub supplier can supply you with shock chemicals.

Before shocking your hot tub, ensure sure it is in the correct pH range. Allow the hot tub water to circulate for at least 20 minutes after applying shock. To find out how long you need to wait before you may safely contact the hot tub water, consult the instructions that came with your shock.

See the video below to learn how to shock your hot tub, or go here for a step-by-step guide.

Step 3 – Empty your hot tub

Draining your hot tub comes next after you’ve shocked it. Getting rid of the organic and chemical waste in your hot tub is your first goal. Plants and other vegetation may be poisoned by the hot tub water. Consider the location of the hot tub’s water drain before making a decision. Your treasured flowerbed or vegetable garden should not be ruined by it.

Drain valves are standard on most inflatable hot tubs, making emptying the tub a breeze. Depending on the model, there may or may not be an outlet to direct the water.

Step 4 – Clean the filters

Remove your hot tub’s filters and give them a good cleaning. Replace them if they’re too old. Your hot tub’s filters are responsible for removing any organic matter or dirt that may be present. Bacteria thrives in filthy environments. The organic waste is all gathered in one location. That’s why it’s so critical to perform routine filter cleanings.

Use a mild soap or detergent to wash the filters. Dirty hot tub filters can be cleaned by placing them in a dishwasher. Dishwasher-safe filters should come with specific instructions. Clean them well and remove all the accumulated dirt from the filter. Wash it until it resembles a brand-new filter. A new filter may be necessary if you can’t.

Step 5 – Clean the surface of your hot tub

The next step is to thoroughly clean your hot tub’s interior. It’s hard to beat white vinegar and water as a cleaning solution. 82% of mold species can be killed by white vinegar. White vinegar and mold can be found here if you’d like further information. Soaps and detergents made from natural ingredients are also an excellent option. Baking soda and water are also effective natural cleansers. As an alternative, you can use natural detergents or soaps.

Another option is to use a 50/50 solution of water and bleach. Bleach is more potent than vinegar or soap, so proceed with caution while using it.

Bleach and baking soda should not be used with vinegar because of the potential for chemical reaction. As a result of the chemical reaction, you run the risk of inhaling toxic chlorine gas.

When cleaning your inflatable hot tub, be careful to select a chemical cleaner that won’t harm the PVC. A nice option is the Starbright Inflatable Boat Cleaner.

Inflatable hot tubs can be cleaned using a sponge or towel. No need for a brush here! The materials of your inflatable hot tub can be damaged if you use a brush to scrub them.

Your hot tub has to be thoroughly cleaned and sanitized. Don’t forget about the nooks and crannies. Microorganisms, like mold, thrive in crevices of any size. Remove the cleaners or chemicals from the surface by rinsing it with clean water after the cleaning process. It’s a good idea to thoroughly dry your hot tub if you don’t plan on refilling it immediately away.

In the video below, you’ll learn how to clean a hot tub from start to finish. If you have an inflatable hot tub, much of the information here is applicable.

Step 6 – Clean the cover of your hot tub

Use the same cleaning method you used to clean your hot tub to clean the cover as well. The cover is a fantastic place for mildew and mold to thrive. If your cover contains an inflatable portion, be sure to clean all sides of the inflatable part. Remove the inflatable section and clean the areas of the cover that aren’t visible. When steam condenses on the inflatable component, water can collect there.

Step 7 – Refill your hot tub now that everything is clean

It’s time to re-fill the hot tub with water now that everything has been completely cleaned. Maintaining a clean hot tub is as simple as following a few basic cleaning procedures now that the mold, mildew, and algae are gone. To keep it from recurring, you should do this now.

How to prevent mold, mildew and algea from growing in your inflatable hot tub

Here are a few tips for preventing mold from returning to your inflatable hot tub after we’ve taught you how to remove it. The easiest approach to keep a hot tub free of mold, mildew, and algae is to keep it clean.

Keep the PH at the correct level

The ideal PH range for your hot tub is 7.4 to 7.6. In this range, Bromine and Chlorine treatments are the most effective. Shock treatments are only effective when the water temperature is within this range. Check the PH of your hot tub on a frequent basis to be sure it’s within this range.

Use enough Bromine

The bacteria in your water are killed by bromine. As soon as your pH is in the proper range, you will need to employ a sufficient amount of bromine. Bromine levels should be kept between 1 and 3 parts per million (ppm). When testing your pH, you should also check your bromine levels to see how many tablets you need.

Clean the filters regularly

Maintain regular filter cleaning. When you frequently use the hot tub, you should clean it at least once a week. Your hot tub water will be cleaner if you use a filter to remove any floating organic particles. Cleaning the filter thereafter is essential in order to eliminate the accumulated debris from the hot tub. Bacteria, algae, and mold thrive in filthy filters, so cleaning them regularly is essential. This completely undermines the objective of filtration. Make sure to replace your filters when they can no longer be cleaned.

Shock your hot tub regularly

In order to maintain your hot tub bacteria-free, bromine can only do so much. The bacteria in your hot tub will be killed if it is shocked. You have a lot of germs in your hot tub if you can smell chlorine or bromine in it. The stench is caused by the bromine destroying bacteria’s byproduct. More germs are responsible for a strong odour. A head start on the bacteria and a reduction in odor should be possible with a hot tub shock.

Drain and clean your hot tub at least every 6 weeks

There is a buildup of substances that come from persons in the hot tub and from outside the tub. The filter and chemicals can no longer handle the buildup over time. This means that the hot tub needs to be drained and thoroughly cleaned in order to start the system over from scratch. Drain and clean every six weeks is a decent interval. As soon as mold and algae begin to grow, drain and clean your hot tub. Your health was already in jeopardy since you had previously been exposed to the mold.

Have everyone shower and clean themselves before getting in the hot tub

A hot tub’s main cause of mold is the dissolution of soap and moisturizer from people’s skin. Bacteria in the hot tub eat a lot of the organic matter that we leave behind in the tub. Before jumping into the hot tub, everyone should wash their hands and dry off. This reduces the rate at which organic matter, oils, and grime accumulate in your hot tub.

Best Black Mold Removal & Cleaning Product Online in The Villages, FL


How do I get rid of black mold in my hot tub?

The lid of your hot tub should be thoroughly cleaned if it is exhibiting signs of mold. Then spritz it with a mixture of dish soap and water and wipe it down. Using a conditioner like Hot Spring Cover ShieldTM after cleaning your cover will help maintain it in good working order for a longer time.

Why is there black mold in my hot tub?

Lack of hygienic water is the most common cause of black mold. Water vapor that condenses in the places we indicated above and grows due to the moisture in the spa due to a lack of sanitizer will not properly eliminate mold spores.

Can black mold be removed?

Ten square feet (approximately 3 feet by 3 feet) of black mold can be cleaned by a homeowner without the assistance of an expert. Using bleach, water, scrubbing, and plenty of fresh air should take care of a small enough patch of mildew. To prevent mold from spreading in your home, make sure there is adequate ventilation and that you wear protective clothing.

Does black mold need to be removed?

If you don’t get rid of black mold as soon as you discover it, it can have a serious impact on your health. First, you’ll need to do a black mold test in order to determine where the problem lies. When there’s a lot of moisture in one place, it’s likely to happen.

Why is there mold on the inside of my hot tub cover?

Your hot tub water will ultimately become contaminated with germs from the buildup of dust and grime on your cover, which will then cause mold and mildew to grow on the bottom of your cover. Once mold and mildew have taken hold, your cover will begin to smell.

How do you remove mold from Lay Z spa?

However, in the event that a mold problem arises, we recommend using a water and dishwashing liquid solution. Mould can be removed from a spa liner by squirting mold spray into the liner’s inflate valve multiple times.

How do you get rid of mold in a hot tub cover?

Using one gallon of warm water, a small amount of mild dish detergent, and one cup of bleach, you may clean your dishes. Wear gloves when using bleach because it might dry up your hands and cause stinging. It’s possible that safety glasses for your eyes would be a good idea as well. Clean the mold with a sponge or a soft bristle brush.

How do I lower the alkalinity in my hot tub?

Muriatic acid and sodium bisulfate are two of the most commonly used compounds for lowering Total Alkalinity in hot tubs (also known as dry acid).

Can I use bleach to clean hot tub?

The molecules lose their color when bleach breaks down the chromophore links between them, and this is what stains are as a result. Be sure to rinse your hot tub well before and after cleaning it with bleach, and never, ever mix bleach with anything other than water.


As a result of this article, you now understand how to remove black mold from a hot tub on your own. Do not hesitate to call a specialist if the damage appears to be extensive.

Helen Skeates

Helen Skeates

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