What Are Phosphates in Your Pool (And Why They Matter)

What Are Phosphates?

Phosphates are naturally occurring compounds that make their way into pool water from both the environment and everyday use. By themselves, they aren’t harmful to swimmers—but they do act as a primary food source for algae.

Where Do Phosphates Come From?

Your pool is being exposed to phoshates from a variety of sources, including:

• Organic debris like leaves, pollen, and dirt

• Water sources, including tap water and rain

• Fertilizer runoff from nearby landscaping

• Swimmers through lotions, sunscreen, hair products, makeup, and personal care products

  
  

Over time, these everyday inputs can cause phosphate levels to steadily build up.

Do Phosphates Go Away on Their Own?

No—phosphates are very stable in pool water. They don’t evaporate, break down in sunlight, or get removed through normal chlorination. Without treatment, they continue to accumulate, increasing the likelihood of algae problems over time.

How Phosphates Impact Chlorine & Water Quality

Ideally there are no phosphates in the pool but under 100-250 parts per billion (ppb) is considered an acceptable level. As phosphate levels rise, they begin to impact how effectively your pool stays clean. Action is required when the level exceeds 500 ppb.

Because phosphates feed algae:

• Chlorine has to work harder to control growth

• Chlorine gets used up faster

• Maintaining proper sanitation becomes more difficult

At excessive phosphate levels, the amount of chlorine required to both manage algae risk and maintain proper sanitation can become elevated—sometimes leading to less stable water balance and potential skin or eye irritation for swimmers.

Controlling phosphates helps keep chlorine effective—so your pool stays cleaner, clearer, and safer for your family to enjoy.

How We Treat Phosphates

At Splash Brothers Pool Cleaning, our goal is simple: keep your pool clean, safe, and comfortable.

When phosphate levels are elevated, we:

• Apply a professional-grade phosphate remover

• Allow the product to bind to phosphates

• Remove them through filtration and routine service

  
  

This helps:

• Reduce algae risk at the source

• Keep chlorine working efficiently

• Maintain clear, balanced, and comfortable water

Keep Your Pool Swim-Ready Year-Round

Managing phosphates is one of the key steps in preventing algae before it starts—helping your pool stay clear, healthy, and ready to enjoy. Ready for hands-free pool maintenance? Call Splash Brothers Pool Cleaning, we'll handle the chemistry—you enjoy the pool.

925-979-8375