How Do I Clean Algae From My Hot Tub?

Shock the water, clean the filters, and use an algaecide to eliminate the algae. Maintain proper sanitizer levels and water balance to prevent future growth.

Why Does Algae Grow in Hot Tubs?

Algae is a common problem in hot tubs, especially during warmer months. The warm, stagnant water provides the perfect breeding ground for algae spores to take hold and thrive.

Several factors can lead to algae growth:

• Low Sanitizer Levels: When sanitizer levels are insufficient, algae has the opportunity to grow freely in the water.

• Clogged or Dirty Filters: A dirty filter cannot remove organic material, dirt, or debris that encourage algae to grow.

• Excess Organic Matter: Skin oils, lotions, and dirt that enter the tub can serve as food for algae.

• Infrequent Water Changes: If the water isn't changed regularly or treated properly, algae can begin to develop and spread.

What Are the Different Types of Algae in Hot Tubs?

There are several types of algae that can grow in hot tubs, each with its own distinct characteristics. Here’s a look at the most common types you may encounter:

• Green Algae: The most common type, green algae grows quickly and can turn your water murky or cloudy.

• Black Algae: A more stubborn type of algae, black algae often attaches to surfaces and can be hard to remove. It thrives in areas with poor circulation.

• Yellow or Mustard Algae: This type of algae is often mistaken for dirt or debris, but it’s just as problematic. It can spread across the surface and leaves a slimy layer behind.

1. Drain and Clean Your Hot Tub

To get rid of algae effectively, you must start by draining your hot tub. This ensures that you’re working with fresh, algae-free surfaces.

• Turn off the Power: Always power down your hot tub before draining it to ensure safety.

• Remove All Water: Use the drain valve to empty the water from the hot tub. If necessary, use a pump to remove the remaining water.

• Scrub the Shell: After draining, scrub the shell of the hot tub with a soft brush to remove any algae buildup. Be sure to clean around the jets and in areas that are harder to reach.

2. Check and Clean the Filter

Your filter plays a vital role in keeping your water clean. If it’s clogged with algae or debris, it won’t be effective in preventing future growth.

• Remove the Filter: Take out the filter and inspect it for dirt, algae, or other build-up.

• Clean the Filter: Use a garden hose or filter cleaner to remove the debris. If the filter is heavily clogged or damaged, it may be time to replace it.

• Soak the Filter: For tough build-up, you can soak the filter in a special filter cleaner overnight to break down stubborn debris.

3. Shock the Water with a Sanitizer

Shocking the water is an essential step to eliminate algae and prevent further growth. A shock treatment will help kill off any algae left in the water.

• Choose the Right Shock Treatment: Use a chlorine or non-chlorine shock treatment designed for hot tubs. Be sure to pick a product that’s compatible with your tub.

• Follow the Instructions: Always follow the manufacturer’s instructions to ensure the correct dosage based on the size of your hot tub.

• Turn on the Jets: Once the shock treatment is added, run the jets for at least 30 minutes to allow the shock to circulate throughout the water.

4. Scrub the Algae-Stained Areas

Even after shocking the water, algae may still remain stuck to the surfaces of your hot tub. This is especially true for black algae or stubborn green algae.

• Use a Soft Brush: Scrub areas where algae is stuck with a non-abrasive brush. Avoid using harsh bristles, as they can scratch or damage the surface.

• Focus on Tough Areas: Pay extra attention to areas around the jets, filters, and waterline where algae tends to accumulate.

• Don’t Forget the Cover: If your hot tub cover has been exposed to algae, clean it as well to prevent contamination when it’s placed back on the tub.

5. Refill and Balance the Water Chemistry

Once you’ve cleaned and scrubbed the hot tub, it’s time to refill it with fresh water. However, before you start using it again, you’ll need to balance the water’s chemistry.

• Test the Water: Use test strips or a testing kit to check the levels of pH, alkalinity, and sanitizer.

  • pH Levels: Aim for a pH between 7.4 and 7.6.

  • Alkalinity Levels: Keep alkalinity between 80 and 120 ppm.

  • Sanitizer Levels: For chlorine, aim for 3-5 ppm.

• Adjust as Needed: If the levels are off, adjust them using the appropriate chemicals. Add pH increaser or decreaser, alkalinity adjusters, or sanitizer.

6. Regularly Maintain Your Hot Tub to Prevent Algae

Once the algae is gone, it’s important to take steps to prevent it from returning. Regular maintenance is key to keeping algae at bay.

• Clean Your Filter: Clean your filter regularly; every 4-6 weeks, to ensure it’s working properly.

• Test the Water: Test your water weekly to make sure your sanitizer levels are stable and that the pH and alkalinity are balanced.

• Keep the Tub Covered: Always cover your hot tub when it’s not in use. A cover prevents debris from entering the water and helps maintain cleaner conditions.

• Maintain Proper Sanitizer Levels: Always keep your sanitizer levels within the recommended range. This is the most important factor in preventing algae.

7. Drain and Refill Your Hot Tub Regularly

It’s a good idea to drain and refill your hot tub every 3-4 months, even if algae isn’t a problem. Over time, water becomes saturated with impurities, which can lead to problems like algae growth.

• Schedule Regular Draining: Set a reminder to drain and refill your hot tub every 3-4 months.

• Thorough Cleaning: When you drain the water, make sure to clean and inspect your tub to prevent future algae growth.

By following these steps, you can effectively clean algae from your hot tub and prevent it from returning. Regular cleaning, testing, and maintaining proper sanitizer levels will help you enjoy clear, clean water in your hot tub all year long. Algae doesn’t have to be a permanent problem, just a temporary one that can be easily tackled with the right maintenance routine.