Few things can ruin a summer pool day faster than looking outside and seeing green water.
The good news? In most cases, algae is preventable. With the right combination of water chemistry, circulation, and routine maintenance, you can significantly reduce your chances of dealing with an algae outbreak during the hottest months of the year.
Whether you have a fiberglass pool, concrete pool, or vinyl liner pool, these five simple tips can help keep your pool clean, clear, and algae-free all summer long.
1. Keep your sanitizer levels up
One of the most effective ways to prevent algae is to maintain consistent sanitizer levels in your pool. For most pool owners, that means keeping chlorine within the recommended range. When chlorine levels drop too low, algae can begin to grow quickly, especially during periods of hot weather.
This is one reason many pool owners choose salt chlorine generators. Rather than adding chlorine manually, a salt system produces chlorine continuously, which can help make it easier to maintain consistent sanitizer levels.
That said, no system replaces regular testing. Be sure to test your water regularly and follow your pool professional's recommendations for maintaining proper chlorine levels, regardless of which system you use.
2. Keep the water moving
One key to remember is that algae likes to start when water stops.
Good circulation helps distribute chemicals evenly throughout the pool and allows your filtration system to remove contaminants before they become a problem.
Running your pool pump consistently during the summer months can help improve water quality and reduce the likelihood of algae growth.
This is why many modern pools use variable speed pumps, which allow constant water flow without the high energy usage.
3. Use the pool
This tip surprises a lot of homeowners.
Regular pool use can actually help keep your water cleaner. When swimmers move through the water, they help stir up debris and particles that might otherwise settle on the floor or collect in low-circulation areas.
Once suspended in the water, those particles are more likely to be captured by the skimmer and ultimately filtering the pool better.
No, swimming isn't a replacement for proper maintenance—but it certainly doesn't hurt.
4. Keep an eye on your filter
Your filter plays a critical role in keeping pool water clear.
Whether you have a cartridge, sand, or DE filter, a dirty filter can slow down water flow and reduce your pool's ability to circulate and clean the water effectively.
Make it a habit to check and clean your filter according to the manufacturer's recommendations. Proper filtration helps support both circulation and sanitation, two of the biggest factors in preventing algae growth.
5. Consider using an algaecide
Although this isn't always necessary, it's another means of algae prevention and something that certainly won't hurt your chances of having a hassle-free summer with your pool.
If you're considering an algaecide, follow the manufacturer's instructions and consult with a pool professional if you have questions about compatibility with your pool's water chemistry.
The key to an algae-free summer
Preventing algae is usually much easier than removing it.
By maintaining proper sanitizer levels, keeping water circulating, monitoring your filter, and staying consistent with routine maintenance, you can greatly reduce the chances of algae taking hold in your pool this summer.
A little attention each week can go a long way toward keeping your pool clean, clear, and ready for swimming whenever the weather heats up.
Frequently Asked Questions
What causes algae in a pool?
Algae typically develops when sanitizer levels are too low or when water circulation and filtration are inadequate. Warm temperatures, sunlight, heavy rainfall, and increased pool use can also create conditions that encourage algae growth.
How do I keep algae out of my pool in the summer?
The best way to prevent algae is to maintain proper sanitizer levels, keep water circulating, clean your filter regularly, and test your water frequently. Consistent pool maintenance is usually the most effective defense against algae growth.
Will a pool filter remove algae?
A pool filter can help remove algae from the water, but it is typically only part of the solution. Algae usually must be killed through proper sanitation before the filtration system can effectively remove it from the pool.
How often should I test my pool water during the summer?
Most pool owners should test their water at least two to three times per week during the summer. Periods of heavy pool use, extreme heat, or significant rainfall may require more frequent testing to ensure water chemistry remains balanced.
From the Author
Algae is a common challenge that pool owners face, especially during the hottest months of the year. Fortunately, a few simple maintenance habits can go a long way toward keeping your water clear and healthy all summer long.
I'm Marcus Sheridan, co-founder of River Pools Virginia, and for more than 20 years I've helped homeowners research, purchase, and care for inground pools.
I wrote this article to share practical tips for preventing algae and maintaining a clean pool throughout the swimming season. My goal is to provide practical information you can use to spend more time enjoying your pool and less time dealing with maintenance headaches.
From the Manufacturer
At River Pools, we believe pool ownership should be about making memories with family and friends—not spending every weekend battling maintenance issues. That's why we create educational resources like this to help homeowners better understand pool care and feel more confident throughout the ownership journey.
If you're considering a fiberglass pool and want to learn more about what ownership looks like beyond installation day, the next step is connecting with a trusted independent installer in your area. They can help you explore your options, answer your questions, and determine what may be the best fit for your backyard and lifestyle.
Ready to start the conversation?
