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March 1, 2025

Preventing Algae Growth as Temperatures Rise

Spring is here, and as the temperatures start climbing, pool owners face a common challenge—algae growth. Warmer weather creates the perfect environment for algae to thrive, turning your crystal-clear pool into a green mess. The good news? With the right steps, you can prevent algae before it even starts. Here’s how:

1. Keep Your Pool Circulating

Stagnant water is a breeding ground for algae. Make sure your pump and filter system run at least 1 hour per 10 degrees. So if it's 80 degrees outside, you run the pump 8 hours during the day. Variable speed pumps can run a little bit different.  A well-functioning filter removes debris and microscopic algae spores before they can multiply.


2. Test and Balance Your Water Regularly

Algae thrive in imbalanced water. To keep them out, check your pH, chlorine, alkalinity, and calcium hardness levels at least once a week. Aim for:

pH: 7.2-7.6

Chlorine: 2-5ppm (parts per million) or 7% of your CYA levels.

Alkalinity: 80-120 ppm

Calcium Hardness: 200-400 ppm


3. Shock Your Pool Weekly

A weekly shock treatment boosts chlorine levels, killing off any potential algae spores before they spread. Use a chlorine-based shock in the evening and let the system run overnight for the best results. This is only necessary in the summer when temps are incredibly high.


4. Brush and Vacuum Your Pool

Algae love to cling to pool walls, floors, and corners. Brushing your pool weekly loosens spores before they can settle and grow. Follow up with a vacuum session to remove any debris that could feed algae growth.


5. Limit Organic Debris in Your Pool

Leaves, dirt, and pollen introduce nutrients that algae feed on. Use a pool cover when not in use, skim your pool daily, and clean out skimmer baskets to remove debris quickly.


6. Maintain Proper Cyanuric Acid (CYA) Levels

CYA stabilizes chlorine, keeping it effective against algae. However, too much CYA can make chlorine less effective. Keep CYA levels between 30-50 ppm to ensure your chlorine works as intended.


7. Monitor Your Water Temperature

Algae thrive in warm water. If possible, keep your pool temperature below 85°F to slow down algae growth. If your pool gets a lot of sun, consider using a pool cover to reduce heat absorption. This also helps keep the water nice and cool when you want to go for a swim!


8. Schedule Professional Maintenance

Sometimes, the best way to keep algae at bay is to let a professional handle it. A pool maintenance service can test your water, adjust chemicals, and perform deep cleanings to ensure algae never becomes a problem.


Stay Ahead of Algae This Spring!

Preventing algae is easier than dealing with a full-blown outbreak. By staying on top of circulation, water chemistry, and cleaning, you can enjoy a sparkling clear pool all spring and summer long. Need help with pool maintenance? Contact PureBlu Pools today for expert service and stress-free pool care!

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