Longer days, rising temps, and the start of summer fun—hot weather and pool season go hand in hand. But as the sun heats up, your pool water is working harder than ever to stay clean, clear, and balanced.

When the temperature climbs, so does the potential for problems like algae, chlorine loss, cloudiness, and scaling. If left unchecked, these issues can turn your swim-ready oasis into a time-consuming chore.

Here’s what you need to know about how heat affects your pool—and what you can do to stay ahead of common warm-weather water problems.

High temperatures and direct sunlight accelerate chlorine degradation. The hotter it gets, the faster your sanitizer evaporates, especially if your pool doesn’t have proper stabilizer levels.

This can leave you with an under-sanitized pool that’s vulnerable to algae, bacteria, and cloudy water—even if it looked fine a day ago.

What to Do:

• Test your chlorine and cyanuric acid (CYA) levels at least once a week
• Maintain CYA between 30–50 ppm for most pools to protect chlorine from UV breakdown
• Consider switching to E-Z POOL®, which contains a stable oxidizer that works alongside your chlorine to control contaminants, even under sun stress
• If you're not using a weekly program, increase your chlorine checks during heat waves

Warm water creates the perfect breeding ground for algae, especially if chlorine levels dip—even temporarily. Algae spores can take hold in shaded corners, steps, or areas of low circulation and spread quickly.

What to Do:

• Keep your pool brushed, especially near ladders and stairs
• Use an algaecide proactively, or choose a weekly product like E-Z POOL®, which includes long-lasting algae control
• Vacuum and skim often to reduce debris that feeds algae growth
• Monitor phosphate levels—high phosphates = high algae risk

Bonus Tip: Use Revive!® WEEKLY to remove phosphates and prevent algae before it starts.

Hot weather brings swimmers, sunscreen, body oils, and other organic waste into your pool—often faster than your sanitizer can keep up. This buildup can overload your filter and lead to dull or cloudy water that no amount of chlorine alone can fix.

What to Do:

• Run your filter longer during hot, high-use periods—up to 12+ hours per day
• Rinse or backwash filters regularly
• Add ENZymePRO® weekly to break down sunscreen, oils, and other organic contaminants that cause hazy water and scum buildup
• Shock after parties or heavy use to restore sanitizer effectiveness

Warmer water causes pH to rise more quickly, which in turn increases the potential for scale formation, especially in hard water areas or pools with salt systems. You might notice a rough texture on surfaces, cloudy water, or calcium deposits around the waterline.

What to Do:

• Test your pH and calcium hardness weekly
• Maintain pH between 7.2–7.6
• Use a product like Revive!® WEEKLY to help prevent scale buildup and keep minerals in balance
• Consider balancing with a weekly care program like E-Z POOL®, which helps regulate pH and includes stain and scale prevention

You’ll lose more water in the summer due to evaporation, especially during dry or windy spells. This affects water balance and chemical concentrations, and may even strain your equipment if levels drop too low.

What to Do:

• Keep your water level halfway up the skimmer
• Refill as needed and test after topping off—source water may throw off your balance
• Use a solar cover to reduce evaporation when the pool isn’t in use
• If you’re seeing ongoing imbalance, treat refill water with Revive!® START UP/CLEAN UP to remove metals, phosphates, and fine particles

Warm weather and swimming go hand-in-hand—but hot conditions put extra pressure on your pool chemistry, filtration, and equipment. Staying consistent with weekly testing, brushing, filtration, and the right treatments will keep your pool clean, clear, and problem-free all summer long.

• Use E-Z POOL® weekly to stabilize and simplify your care routine
• Add ENZymePRO® to prevent cloudiness from swimmers, oils, and debris
• Treat with Revive!® WEEKLY to handle phosphates and scale before they create trouble

With the right mid-season habits in place, your pool will stay as cool, clear, and inviting as a perfect summer day.