Algaecide is an excellent tool that pool owners use to kill off algae in pool water. While you shouldn’t use it as a replacement for chlorine, algaecide is an effective option if you need that extra power to kill off an algae infestation. Whether you are a new pool owner or simply want to brush up on your algaecide knowledge, if you understand how to use it, you will be able to use it as effectively as possible.
In this article, I provide a full breakdown of what algaecide is, list the different types, and explain how to utilize it effectively. Let’s get into it.
Main Takeaways
Algaecide is not a quick solution to completely get rid of algae in your pool. It is more often used as a preventative measure rather than a reactive treatment. Algaecide is a chemical that not only kills algae but also stunts their growth in your pool.
Most of the algaecides on the market contain a copper base, usually derived from copper sulfate. These chemical compounds utilize metal as its primary atom, which helps attack algae much more effectively.
So, how exactly does algaecide work? Simply put, algaecide discourages the typical cellular growth process of algae. By blocking cell division or energy transfer, this chemical limits the creation of newer cell proteins, which help algae survive.
When you use algaecides, please ensure you wear the appropriate personal protective equipment, which will be recommended on the product label. Generally, I recommend at least wearing rubber gloves and goggles.
You can choose from a few different types of algaecides. Below, I will list the best pool algaecides on the market in each type and when to use them.
A Quat pool algaecide, also known as a Quaternary Ammonium compound, is the most budget-friendly type of algaecide. It works as a microbial disinfectant. Quat algaecides work by attaching themselves to negatively charged algae cells. And once bonded with the algae, they disintegrate the outer protective membrane. Finally, by dissolving the outer layer, the chlorine is then able to kill the cell’s nucleus.
Remember that since they are basically a detergent, Quat pool algaecides can cause some foaming when overused. But with that said, if you want the most bang for your buck, this is an excellent algaecide option and comes in both 50% and 10% concentrations. You can pick some up from Clorox for pretty cheap.
Here's a Clorox algaecide that works well in every pool I've used it in.
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This type of pool algaecide holds copper ions, a trusted solution in water treatment for thousands of years. To minimize potential staining from overuse, the copper is bonded with amino acids. Much like the other algaecides on the list, the positively charged metal ions attach themselves to the algae, invade the algae walls, poison the enzymes, and attack the nucleus.
Metallic pool algaecides are an ideal option for black algae and are also useful against green and yellow algae. Most average copper algaecides run between 7% and 9% copper strength or concentration. Below is a good option from In the Swim.
In The Swim makes great pool maintenance products, and this algaecide works very well if you need a metallic pool algaecide.
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Polymer pool algaecides, or Poly-Quat compounds, are versatile algaecide options because they are both non-staining and non-foaming. These positively charged polymers spread over the algae cell’s surface and surround the cell for the kill – two times faster than Quat algaecides.
Poly-Quats are much longer-lasting and more effective than regular Quat algaecides but are also more costly. These algaecides usually get sold in 60% and 30% strengths or concentrations. If you are someone on a budget, you may want to research other options. But this multi-season algaecide provides a consistent cleaning no matter what time of year it is. I recommend the Rx Clear algaecide.
Rx Clear makes a strong Poly-Quat algaecide that is more expensive, but also more effective.
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Sodium Bromide is not an algaecide, but when mixed with granular chlorine, it makes for the perfect catalyst to fix your algae-filled pool. The pool shock plays a pivotal role in converting the bromides into an algae killer.
Bromides are not usually used to prevent or control algae like algaecides, but it is used to deal with more severe cases of algae infestations in the pool. It works effectively against yellow or green algae that are not responding to a chlorine shock. No Mor Problems makes a good option.
United Chemical makes an effective sodium bromide option for tough algae outbreaks. It's also used to prevent algae.
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Algae can come in many different forms. Below are the main types of algae that will make a home in your swimming pool:
Although algaecide is specifically designed to kill algaecide, it is not necessarily the most effective solution. Chlorine is much more successful at getting the job done, even if your walls are extra slimy and your walls are cloudy. According to the Missouri Department of Health, chlorine reacts with water to produce a sanitizing species, hypochlorous acid, to kill algae.
Chlorine’s differentiating factor is its ability to oxidize single-celled algae and bacteria. When chlorine is implemented, it trades electrons with the algae. When this exchange happens, the cell walls of the algae get ruptured. As soon as the process is complete, the algae cells are deprived of the necessary nutrients. Over time, consistent use of chlorine will limit the algae replication and growth process.
Much of the battle here is ensuring you maintain an ideal pool water chemistry with chlorine, bromine, or biguanide. Combined with a balanced pH level, this will be an effective protector against algae growth in your pool.
Algaecides serve as a secondary sanitization option for your maintenance system and prevent the ugly sight of algae in the pool. The key word here is prevention. So, don’t wait till it’s too late! Here’s everything you need to know about when to use algaecide:
As a top tip: After adding algaecide, make sure to run your pool pump and filter to evenly distribute the algaecide throughout the pool.
