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The Home Depot

Why Is My Pool Water Cloudy?

Pro Referral > Home Guides > Pool and Hot Tub > Why Is My Pool Water Cloudy?
Why Is My Pool Water Cloudy?

Although a backyard pool can provide many opportunities for family enjoyment and exercise, maintaining it can be expensive and challenging. You will need to stay vigilant for problems and issues to keep your pool safe and to avoid problems with the quality of your pool water.


The Central District Health Department has important information that can help you maintain the quality and safety of your pool water. If the water quality deteriorates to a specific point, you may even need to suspend swimming in your pool until you correct the situation.


If you’re wondering why your pool is cloudy, it’s time to take swift measures to remedy the situation to keep your family and friends safe in your pool.

  1. If you use an algaecide product to eliminate bacteria from pool water, it’s common for the pool water to become cloudy from the dead algae.

    1.Pool Chemicals

    When the balance of pool chemicals is not correct in your swimming pool, cloudy water will result. This is the most common cause of cloudy water in all types of swimming pools. An imbalance in swimming pool water will allow algae to develop and grow in the pool water. Not only is algae unsightly, but it can also be harmful to the health of people using your pool.


    You must also maintain the correct pH balance of your pool to keep the pool water clean. The correct pH level of a swimming pool is 7.4 – levels falling between 7.2 and 7.8 are acceptable.

  2. 2.Dead Algae

    If you use an algaecide product to eliminate bacteria from pool water, it’s common for the pool water to become cloudy from the dead algae. Living algae creates a green color in pool water and dead algae creates a gray or cloudy appearance in pool water.


    To remedy dead algae, you have two options:

    1. 1) Add a flocculant product to bind the dead algae together. Once the dead algae binds together, it will sink to the bottom of the pool. After this occurs, you can remove it by using a pool vacuum.
    2. 2) Add a clarifying product to coagulate the algae. This will enable your pool filter to remedy the problem without vacuuming the pool.
  4. 3.Preventing Cloudy Pool Water

    Perform weekly maintenance to prevent cloudy water:

    • • Scrub the pool walls and steps once each week.
    • • Skim debris from the pool daily.
    • • Clean the underside of the pool cover to prevent it from contaminating the pool water.

    Control contaminants in the pool that occur from swimmers:

    • • Require swimmers to shower before swimming.
    • • When you expect an increased number of swimmers, add additional sanitizer to the pool prior to swimming.

    Reduce environmental issues that contribute to cloudy water:

    • • Trim trees and shrubs that hang over the pool and drop debris into the water.
    • • Always cover the pool to eliminate dust and rainwater from contaminating the water.

    Although a backyard pool requires extra effort and expense, the enjoyment you experience from the pool can make the additional work worth it. If you have problems that you can’t resolve with careful maintenance, consider hiring an expert to help you evaluate the problem. You may find that the filtration system isn’t operating efficiently or the system could even be the wrong size for your pool.

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