
How to Fix High Chlorine and Low pH in Pool
A Step-by-Step Guide to Balancing Your Pool Chemistry
Fixing high chlorine levels and low pH in your pool is crucial for maintaining a safe and enjoyable swimming environment. High chlorine can lead to skin irritation and unpleasant odors, while low pH can cause corrosion of pool equipment and surfaces. This guide will provide you with actionable steps to effectively balance your pool chemistry.
In this comprehensive guide, we will cover the necessary tools and materials, safety precautions, and a detailed troubleshooting checklist to help you restore your pool to optimal conditions.
Understanding Pool Chemistry
Before diving into the solutions, it's essential to understand the role of chlorine and pH in pool maintenance. Chlorine is a sanitizer that kills bacteria and algae, while pH measures the acidity or alkalinity of the water. The ideal pH level for pools is between 7.4 and 7.6, and chlorine levels should be maintained between 1-3 ppm (parts per million).
Step-by-Step Guide to Fix High Chlorine and Low pH
Required Tools and Materials
- pH test kit
- Chlorine test kit
- pH increaser (sodium carbonate)
- pH decreaser (sodium bisulfate)
- Water hose
- Pool water balancing chemicals
Safety Notes
- Always wear gloves and goggles when handling pool chemicals.
- Store chemicals in a cool, dry place away from direct sunlight.
- Never mix different chemicals together.
- Test Your Water: Use the pH and chlorine test kits to determine the current levels. Record the results.
- Dilute the Chlorine: If chlorine levels are higher than 3 ppm, dilute the pool water by adding fresh water. Use a hose to fill the pool until the chlorine level drops within the ideal range.
- Adjust the pH: If the pH is below 7.4, add a pH increaser (sodium carbonate) according to the manufacturer's instructions. If it’s above 7.6, use a pH decreaser (sodium bisulfate).
- Retest the Water: After adding chemicals, wait for at least 4 hours and retest the water to ensure levels are balanced.
- Monitor Regularly: Keep an eye on the chlorine and pH levels weekly to prevent future issues.
Comparison Table of pH Adjusters
Chemical | Purpose | Usage Instructions |
---|---|---|
Sodium Carbonate | Increases pH | Add 1 pound per 10,000 gallons to raise pH by 0.2 |
Sodium Bisulfate | Decreases pH | Add 1 pound per 10,000 gallons to lower pH by 0.2 |
Key Takeaways
- Regular testing of pool water is essential for maintaining balance.
- High chlorine levels can be diluted by adding fresh water.
- pH levels can be adjusted with specific chemicals based on the current readings.
- Monitor your pool chemistry weekly to avoid future imbalances.
Quick Facts
- Regular testing of pool water is essential for maintaining balance.
- High chlorine levels can be diluted by adding fresh water.
- pH levels can be adjusted with specific chemicals based on the current readings.
- Monitor your pool chemistry weekly to avoid future imbalances.

Jaden Bohman is a researcher led writer and editor focused on productivity, technology, and evidence based workflows. Jaden blends academic rigor with real world testing to deliver clear, actionable advice readers can trust.
How we created this article
This piece was drafted using editorial templates and may include AI-assisted sections. All content is reviewed by the InfoBase editorial team for accuracy, clarity, and usefulness before publishing.