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Step-by-Step Guide on how to Remove Dead Algae from Pool Bottom

how to remove dead algae from pool bottom


If you own a pool, you know how difficult it can be to keep it clean and healthy. One common problem is the buildup of dead algae on the bottom of the pool, which can make the water cloudy and uninviting. Not only does this look bad, but it can also pose a health risk to swimmers. In this step-by-step guide, we’ll show you how to remove dead algae from pool bottom and keep your water crystal clear.

Overview of dead algae in pool and its impact on health

Dead algae is a common problem in pools, especially after treating a green pool with shock to kill the algae. Algae dust is actually dead algae that has settled on the bottom of the pool, making it look brown and cloudy. Although dead algae may not present a health problem to swimmers, the fine particles will inevitably get stirred up by swimmers and create a brown, cloudy mess in the pool.

Why it’s important to remove dead algae from pool bottom

Dead algae that is left unattended on the lining or in the bottom of your pool can also lead to organic stains, which are more difficult to remove than dead algae alone. This is why it’s important to remove dead algae as soon as possible to avoid developing these stains. Additionally, algae buildup can lead to greater problems down the road, such as clogged filters and decreased water quality.

Step-by-Step Guide to Removing Dead Algae

Step 1: Test Your Water Chemistry

Before you start, it’s important to check the water chemistry. More specifically, run some chlorine and pH tests on the pool water. Any form of algae in a pool is not good news. Algae dust is no exception as once you have dealt with a green pool and killed an algae bloom using chemicals it sits on the bottom of the pool making it look very unpleasant.

pH balance

The pH level of your pool water should be between 7.2 and 7.8. If it’s too high or too low, it can affect the effectiveness of your chlorine and other chemicals.

Chlorine levels

Make sure your chlorine levels are at least 1ppm (parts per million) to effectively kill any remaining algae in the pool.


The alkalinity of your pool water should be between 80-120ppm. This helps to stabilize the pH level and prevent fluctuations.

Step 2: Brush the Pool Bottom

Using a stiff bristled brush, scrub affected areas of your pool’s lining. Brush in a circular motion, focusing on problem areas where dead algae has settled. This will help to loosen the dead algae and make it easier to vacuum up.

Use a Pool Brush

Be sure to use a pool brush specifically designed for this purpose. Using a regular household brush can damage your pool lining and cause further problems.

Brush in a Circular Motion

Brushing in a circular motion helps to loosen the dead algae and makes it easier to vacuum up.

Focus on Problem Areas

Concentrate on areas where dead algae has settled the most. These areas will require more attention and elbow grease.

Step 3: Vacuum the Pool Bottom

Attach the vacuum head to the hose and submerge it in the pool. Move slowly across the pool bottom, being careful not to disturb the water too much. Any dead algae that is disturbed will probably float in the pool water and then settle again later which you will want to avoid since you will probably then need to vacuum again.

Attach the Vacuum Head to the Hose

Make sure the vacuum head is securely attached to the hose.

Submerge the Vacuum Head

Submerge the vacuum head in the pool and turn on the pump.

Move Slowly Across the Pool Bottom

Move the vacuum head along the bottom slowly in order to disturb the algae dust as little as possible.

Step 4: Backwash the Filter

After vacuuming, it’s important to backwash the filter to remove any dead algae particles that may have been trapped. Turn off the pump, turn the valve to “backwash,” and turn the pump back on. Let it run for a few minutes until the water coming out is clear.

Turn Off the Pump

Before backwashing, switch off the pool pump to avoid any damage to the system.

Turn Valve to “Backwash”

Set the multiport valve of the filter to the “backwash” position. This will ensure that the water is expelled from the pool rather than passing through the filter and going back in the pool.

Turn On the Pump

Turn the pump back on and let it run for a few minutes until the water coming out is clear.

Step 5: Repeat as Necessary

If you still notice dead algae in the pool, you may need to repeat the brushing, vacuuming, and backwashing process. Test the water again to ensure that the chemistry is still balanced and make any necessary adjustments.

Test the Water Again

After vacuuming and backwashing, test the water chemistry once more to ensure everything is balanced. Add any necessary chemicals to bring the levels back to normal.

Brush and Vacuum the Pool Bottom

Repeat the process of brushing and vacuuming the pool bottom if any dead algae remains.

Backwash the Filter

Backwash the filter again after vacuuming to remove any trapped dead algae particles.


Removing dead algae from your pool bottom can be a time-consuming process, but it’s essential for maintaining a clean and healthy swimming environment. By following this step-by-step guide, you’ll be able to effectively remove dead algae and keep your pool looking crystal clear. Remember to always test your water chemistry and ensure proper filtration to prevent future algae build-up. Happy swimming!

Preventing Algae Buildup in the Future

The easiest way to prevent any algae buildup in the pool is to use an algaecide. Algaecides are very easy to use as long as you follow the manufacturer’s instructions. Be sure to use it according to the requirement; don’t add too much. And keep in mind the recommended waiting time before letting anyone in the pool.

Maintaining Your Pool Filter

Sand filters are also essential for removing algae and other debris from your pool. But whenthey get clogged, they won’t do their job right. Make sure the sand filter is clear by backwashing it regularly, as described in Step 4 above. Additionally, you should replace the sand in your filter every 5-7 years to ensure it stays effective at trapping debris.

Tips for Keeping Your Pool Clean and Algae-Free

Aside from using an algaecide and maintaining your pool filter, here are some additional tips to help keep your pool clean and algae-free:

  • Regularly skim the surface of your pool to remove leaves and other debris.
  • Keep your pool cover clean to prevent dirt and debris from entering the pool when the cover is removed.
  • Ensure proper circulation by running your pool pump for the recommended amount of time each day (usually around 8-12 hours).
  • Shock your pool regularly (about once a week) to maintain proper chlorine levels and prevent algae growth.
  • Regularly test your water chemistry and make any necessary adjustments to keep it balanced.
  • Keep the area around your pool clean and free of debris to prevent it from blowing or washing into thepool.

When to Call a Professional Pool Service

While most pool maintenance tasks can be done by the average pool owner, there are situations where it’s best to call in a professional pool service. If you’re struggling with persistent algae issues, or if your pool water chemistry is proving difficult to balance, a professional can help identify and resolve the problem more efficiently. Additionally, if your pool equipment is malfunctioning or you’re unsure how to properly maintain it, a professional can provide guidance and assistance.

Keeping Your Pool Safe and Inviting

A clean, algae-free pool is essential for both the health of your swimmers and the overall enjoyment of your pool. By following our step-by-step guide, maintaining your pool filter, and implementing regular pool maintenance tasks, you can keep your pool looking crystal clear and inviting all season long. With a bit of effort and attention to detail, you’ll be able to enjoy a beautiful, healthy pool that’s safe for everyone to enjoy.

Frequently asked questions

Does clarifier remove dead algae?

Yes, a clarifier can help remove dead algae from your pool. Clarifiers work by clumping together small particles, including dead algae, into larger particles that can be more easily trapped and removed by your pool’s filtration system. Using a clarifier in conjunction with regular pool maintenance tasks can help keep your pool clean and free of algae.

Can dead algae come back to life?

No, dead algae cannot come back to life. Once algae is killed, it cannot revive itself. However, new algae can grow and spread in your pool if the conditions are favorable, such as warm temperatures, sunlight, and imbalanced water chemistry. To prevent new algae growth, maintain proper water chemistry, circulation, and sanitation, and follow a regular pool maintenance routine.

How to get dead algae out of intex pool?

To get dead algae out of an Intex pool, follow these steps:

1. Balance the water chemistry: Ensure that your pool’s pH, alkalinity, and sanitizer levels are within the recommended range. This will help prevent new algae growth and make it easier to remove dead algae.

2. Use a pool clarifier: Add a pool clarifier to your Intex pool according to the manufacturer’s instructions. This will help clump together the dead algae particles, making them easier to remove.

3. Brush the pool surfaces: Use a pool brush to scrub the walls, floor, and any other surfaces where dead algae may be present. This will help dislodge the algae and allow it to be removed more easily.

4. Vacuum the pool: Using a manual or automatic pool vacuum, clean the bottom of your Intex pool to remove the dead algae and any other debris. If using a manual vacuum, ensure you move slowly and methodically to avoid stirring up the dead algae and making it harder to remove.

5. Clean the filter: Whether your Intex pool has a cartridge, sand, or diatomaceous earth (DE) filter, it’s essential to clean it regularly, especially after removing dead algae. Follow the manufacturer’s instructions for cleaning your specific filter type.

6. Run the pump: After vacuuming and cleaning the filter, run your pool pump for at least 8-10 hours to circulate the water and ensure all dead algae is removed.

7. Monitor and maintain: Keep an eye on your pool’s water chemistry and cleanliness, and continue with regular maintenance tasks to prevent future algae growth.

By following these steps, you can effectively remove dead algae from your Intex pool and keep it clean and inviting for everyone to enjoy.

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