Hot Tub Scale – Prevention And Removal Guide


Finding a scale in your hot tub can be frustrating and alarming. This can set many people off in an instant! These scales will often be evident on the surface of the tub’s shell. In some cases, they are hidden from sight since they can also form in the plumbing or other unexposed components.

Inevitably, hot tub scales will eventually show up. Even if you pay attention to hot tub care and maintenance, scales can also be present. Luckily, if you know the right way to deal with it, you can get rid of the problem easily.

Want to know more about the hot tub scale? Keep on reading and we’ll let you know the best ways to prevent and remove the scale!

What is a Hot Tub Scale?

Before we talk about the best solutions for hot tub scaling, let’s first define what exactly a scale is.

Scale refers to a mineral-based build-up. There are four main types of hot tub scaling – barium sulfate, calcium phosphate, calcium sulfate, and calcium carbonate.

Using hard water causes unsightly flakes on the hot tub, which can also clog plumbing. Even if you have the best hot tub, when water is not balanced, and if you don’t maintain the tub properly, scaling can be an issue. While it is often an indication of calcium build-up, the scale can also be a sign of white water molds in a hot tub.

Preventing Hot Tub Scale

Prevention is better than cure, even when it comes to hot tub scaling. That said, below are some of the best preventive measures.

1. Balance Water

You must learn how to balance pH in a hot tub if you want to prevent scaling. If the pH is too high, scales can start to form. Bring it down to an acceptable level to prevent the hardness of the water in your hot tub. Adding chemicals in the water, such as sodium bisulfate, is one of the easiest solutions. This can also be a promising solution if you want to fix a cloudy hot tub.

2. Keep the Filter Clean

Your filter could also be the culprit for the formation of the hot tub scale. Your hot tub filter cartridges have an important role in maintaining the quality of water. When the filters don’t function properly, the water can cause scales. It is important to clean hot tub filters regularly or replace them when needed.

3. Use a Scale Preventer

Removing and preventing hot tub scaling will be easy with the products that are available on the market. Some hot tub manufacturers may offer their versions of a scale preventer. Apply these products regularly as instructed.

4. Keep Your Hot Tub Clean

Aside from the filter, pay attention to the other parts of the hot tub to keep it clean to prevent a hot tub scale. Doing this will also help you to unlock the hot tub health benefits you can enjoy!

Removing Hot Tub Scale

There are some instances when it is too late. The flakes are already there. However, this isn’t a hopeless case. With time and effort to spare, below are some of the best solutions.

1. Use a Vinegar Scrub

Vinegar is an all-around house cleaner that can also be promising when it comes to hot tub scaling. First, drain the hot tub and use a dry towel to wipe the surface. Mix one-part vinegar and one-part distilled water. Put it in a spray bottle and spray it on the hot tub, especially on the part where you can see the scale. Let it sit for about five minutes. Scrub with a nylon brush, rinse, and dry. Do not use harsh abrasives or stiff brushes because they can damage the shell of the hot tub.

2. Use Bleach and Dishwasher

Fill the tub with water just slightly above the opening of the jets. Add half a cup of dishwasher detergent and one cup of bleach. Turn on the hot tub jets. Drain the water. Fill the tub with water and wait for 15 minutes. Drain and wipe the surface to get rid of any residue. This will also work if you want to get rid of yellow algae in a hot tub.

3. Use a Calcium Remover

This is a product specifically made for the removal of the hot tub scale. You can buy it in local stores selling pool supplies. Spray it directly on the area where you can see the scale. Eventually, there will be bubbles or foam. Scrub until you get rid of the flakes. Be careful when scrubbing to avoid damaging the surface of the hot tub.


Allow us to answer a few of your questions about hot tub scaling before we end this article.

Q: What Causes Hot Tub Scales?


Hot tub scales are caused by the hardness of the water. There are high amounts of calcium present in water. This will deposit on the hot tub and will create a pesky and unsightly white film on the surface. The pH in the hot tub water can also be the culprit for the scales.

Q: How Do I Remove Scale from my Hot Tub?


You can remove scale from the hot tub using natural solutions, such as vinegar scrub. You can also rinse the surface using bleach and dishwashing soap. Calcium remover can also be effective.

Q: How Do You Get Rid of Calcium Build Up in a Hot Tub?


To get rid of calcium build-up, correct the hardness of water by lowering the pH level. A scale preventer can also be promising. Inspecting the filter and getting rid of the build-up is another promising solution.

Globo Surf Overview

When it comes to the hot tub scale, prevention is better than cure. So, test hot tub water and lower the pH level, clean the filter, and use a scale preventer. If the pesky scales are already evident, however, use solutions like vinegar and distilled water or bleach and dishwashing detergent to remove hot tub scaling.

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Globo Surf
My name is David Hamburg. I am an avid water sports fan who enjoys paddle boarding, surfing, scuba diving, and kite surfing. Anything with a board or chance I can get in the water I love! I am such a big fan I decided to start this website to review all my favorite products and some others. Hope you enjoy!