How to Get Algae Out of Pool?

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By Deirdre Mundorf

Updated: Jun 06, 2024

8 min read

How to Get Algae Out of Pool
Photo: @premierpoolsandspas

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    When Algae appears, it poses a threat to the pool cleanliness, requiring prompt action. Algae grows in our environment and thrive on still water like pools, using sunlight, water and carbon dioxide for its photosynthesis process. Factors like low chlorine levels, pH imbalances, dirty filters or poor circulation create favorable conditions for algae growth. Additionally, contaminated objects like pool toys or swimming suits  which are frequently used can introduce algae into the pool environment. With proper and regular cleaning of the pool you can avoid the algae growth.

    Eliminating Dead Algae From Your Pool

    Algae include black, green, pink, and yellow variations. Algae is everywhere, found in nearly any soil or plant debris. Its lightweight nature facilitates easy spread, with even a gentle breeze capable of transporting it into swimming pools and onto swimwear. Once subjected to a shock treatment, algae succumbs and settles at the pool's base, resembling a white, gray, or brown sediment that is difficult to remove. Despite its seemingly harmless presence, deceased algae can impart an unsightly appearance to an otherwise clean pool if left unaddressed. As a pool owner, you may be curious about the most effective approach to eliminating dead algae.

    Also Read: What is the Best Time to Shock The Pool?

    Utilizing a Multiport Valve for Algae Eradication

    For eradicating algae, the use of a multiport valve allows for the redirection of water flow in various directions, providing flexibility for different maintenance tasks as needed.

    Setting Up the Bypass

    You will require a specific setting known as bypass, which channels water away from the pool and directs it out through the backwash hose without passing through the filter.

    Shutting Off the Pump

    To initiate the process, shut off the pump and adjust the valve to either the waste or drain position.

    Start Vacuuming

    Afterward, restart the pump and commence vacuuming. When targeting algae removal, it is crucial to move the vacuum head slowly across the pool bottom.

    Thorough Coverage

    Pay close attention to areas with visible algae growth, ensuring thorough coverage to eliminate all traces. Given that water will be rapidly pumped out of the pool, it is advisable to work swiftly. However, if needed, you can extend the process by simultaneously filling the pool with water using a hose.

    Managing Water Flow

    Once your time is up, you will notice the skimmer making a slight sound and drawing in the air. When this happens, it is time to pause. If you haven't completed the task, turn off the pump, refill the pool, and repeat the procedure.


    However, if you have successfully cleared all the algae, your task is done. Turn off the pump, return the valve to the filter position, refill the pool, and follow the subsequent maintenance instructions provided.

    Alternative Algae Eradication Method

    Alternative Algae Eradication Method
    Photo: @grantlannin

    For those lacking a multiport valve, an alternative method proves effective. Without this valve, redirecting waste directly out of the pool becomes infeasible, necessitating filtration beforehand. This complication becomes evident as debris sucked up tends to circulate back into the pool, worsening the issue.

    To initiate this procedure:

    1. Prepare your pool vacuum, whether manual or robotic and guide it through the filter, targeting the algae.
    2. Upon observing irregularities in the filter's function, pause and inspect it.
    3. Cleanse and restore the cartridge to its original clarity, as this step may need to be repeated.

    Patience is key in mastering this process. It is important to note that if persistent filter malfunctions hinder the completion of the task, seeking professional assistance is advisable.

    Algae Treatment and Pool Maintenance

    Adjust parameters such as pH accordingly. Proceed to shock the pool, adjusting the dosage based on the severity of the algae infestation. Dead algae typically appear as a cloudy blue hue after treatment.

    Keep the filter running continuously to remove dead algae from the water. Optionally, utilize a clarifier or flocculant to expedite the process, followed by thorough cleaning of the filter.

    How Long Will It Take to Clear the Pool?

    The duration varies based on factors like pool size, type and extent of algae growth, and construction material. For instance, eliminating black algae demands more effort than green algae. Additionally, the pool's material can influence the timeframe.

    A rough estimate for clearing a fully infested pool ranges from one to three days for fiberglass or vinyl pools, while concrete pools may require up to a week. However, the timeframe is subject to variation depending on the pool's dimensions and algae quantity.

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