How Long Does Algaecide Take To Work

How Long Does It Take Algaecide To Work?

Whether you are preparing to use an algaecide in your pool, or have used one recently and are awaiting your results, you may be wondering how long it takes copper algaecide products to work.

In this article, we will talk about how long it takes for algaecides to kill algae, and the best times to use algaecides in your pool.

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Speed of Algaecide Products

Most copper algaecide products will kill off all algae in your pool within the first 24 hours after you have added it. If you have a very large algae problem, you may experience a longer wait time.

Be aware that algae can also remain in your pool after it has been killed by the algaecide. This can make your algaecide seem ineffective, when in reality it has done its job, and it’s now up to the filter to get rid of the dead algae.

Additionally, some algaecides are simply not as strong as others, or may contain less active ingredients. It’s also important to know that your product will only work effectively if you have followed the instructions provided, as some products rely on specific chlorine or pH levels.

Most people who use algaecides for the first time are unaware that they should be used as either a preventative measure, or in conjunction with other treatment methods if you already have an algae outbreak.

When treating an algae infestation, algaecide is most effective when used in addition to thorough scrubbing and shock treatment of your pool.

Also make sure that you are using the right dose of algaecide for your pool by consulting the algaecide calculator.


When asking how long it takes for copper algaecide to work, it is important to take into consideration what you are using the algaecide for.

Most algaecides are not intended as a standalone treatment against intense algae problems, but are rather intended to be used preventatively or as a follow-up to other treatments.

Do you have any questions about how long it takes for algaecides to kill algae? Leave us a comment down below, we’ll do our best to help you out!

Louis from Pool Advisor


A chemical engineer by trade, Louis is committed to debunking myths in the pool industry by explaining the underlying chemistry and making it accessible to all.