How Do I Prevent Phosphates in My Pool?

Regularly monitor phosphate levels and use a phosphate remover like our AquaDoc Phosphate Remover.

What Are Phosphates and How Do They Get in Your Pool?

Phosphates are naturally occurring compounds found in many sources, including:

• Leaves, grass, and other organic debris
  

• Lawn fertilizers and garden runoff
  

• Swimmer waste, such as sweat and body oils
  

• Detergents, soaps, and cleaning products
  

• Tap water, depending on your local water supply
  

Once phosphates enter the water, they provide an abundant food source for algae. Even with proper chlorine levels, a high phosphate concentration can lead to persistent algae growth.

Why Should You Prevent Phosphates in Your Pool?

High phosphate levels can cause several issues, including:

• Increased Algae Growth – Algae thrive in pools with excess phosphates.
  

• Higher Chemical Demand – You may need more chlorine and algaecide to keep the water clear.
  

• Cloudy Water – Phosphate buildup can contribute to dull or cloudy pool water.
  

• More Frequent Cleaning – With higher phosphate levels, you may need to brush and shock the pool more often.
  

How to Prevent Phosphates in Your Pool

1. Keep Debris Out of the Pool

Organic debris, such as leaves and grass, introduces phosphates into the water. Reduce this risk by:

• Skimming the pool daily to remove floating debris
  

• Using a pool cover when the pool is not in use
  

• Trimming trees and bushes near the pool to minimize falling leaves
  

2. Maintain Proper Pool Filtration

A well-functioning filtration system helps remove contaminants before they break down and contribute to phosphate buildup.

• Clean the skimmer and pump baskets regularly
  

• Backwash or clean the pool filter as recommended by the manufacturer
  

• Run the pump for at least 8-12 hours a day to ensure proper water circulation
  

3. Control Runoff and Water Contamination

Fertilizers and other chemicals used around your yard can wash into the pool, adding phosphates. Prevent this by:

• Directing rainwater away from the pool
  

• Avoiding the use of phosphate-based fertilizers near the pool area
  

• Keeping pets and excessive foot traffic away from the pool water
  

4. Use Phosphate-Free Pool Chemicals

Some pool products, including algaecides and clarifiers, contain phosphates. Check labels carefully and choose phosphate-free alternatives when possible.

5. Regularly Test for Phosphates

Testing for phosphates is an important part of pool maintenance. Here’s how to do it:

• Use a phosphate test kit or take a water sample to your local pool store
  

• If phosphate levels exceed 100 ppb (parts per billion), take action to lower them
  

• Test the water at least once a month, or more often during heavy use
  

6. Use a Phosphate Remover When Needed

If phosphate levels are high, a phosphate remover can help eliminate them. Here’s how:

• Choose a quality phosphate remover designed for pools
  

• Follow the product’s instructions carefully for dosing
  

• Allow the filter to run continuously for at least 24 hours to remove the phosphates
  

How to Keep Phosphate Levels Low Long-Term

Preventing phosphates is an ongoing process. To maintain low phosphate levels:

• Stick to a consistent pool maintenance routine
  

• Shock the pool weekly to eliminate contaminants
  

• Keep swimmers from introducing soaps, lotions, or other phosphate-containing products into the pool
  

• Regularly clean pool toys and accessories before putting them in the water
  
  

When to Take Action Against Phosphates

If you notice any of the following signs, it may be time to check and lower phosphate levels:

• Recurring algae growth despite proper chlorine levels
  

• Cloudy or dull-looking water
  

• Increased chlorine demand without clear results
  

By taking proactive steps to prevent phosphates, you can reduce algae problems, improve water clarity, and spend less time on pool maintenance.