Maintaining the proper pH balance in your swimming pool is essential for the health and safety of swimmers, the effectiveness of sanitizing chemicals, and the longevity of pool equipment. The ideal pH range for pool water is between 7.2 and 7.8. Here’s a step-by-step guide on how to adjust swimming pool pH:
Testing the pH Levels
Obtain a Test Kit: Use a reliable pool test kit or test strips to measure the pH level of your pool water. These kits typically provide a color-coded chart to compare the results.
Collect a Water Sample: Follow the instructions on the test kit to collect a water sample from your pool. It’s best to take the sample from about 18 inches below the surface for an accurate reading.
Perform the Test: Add the testing reagent to the water sample as directed and compare the color change to the chart provided. This will indicate the current pH level of your pool.
Lowering the pH
If the pH level is above 7.8, it’s necessary to lower it. High pH can cause scale buildup, cloudy water, and reduce the effectiveness of chlorine.
Choose a pH Reducer: The most common chemicals for lowering pH are muriatic acid and sodium bisulfate (dry acid).
Read the Instructions: Carefully read the manufacturer’s instructions on the pH reducer product. The amount needed will depend on the volume of your pool and the current pH level.
Dilute the Acid (if necessary): If using muriatic acid, it’s often recommended to dilute it in a bucket of water before adding it to the pool. Always add acid to water, not water to acid, to avoid a dangerous reaction.
Add the Chemical: Slowly pour the diluted acid or sodium bisulfate into the pool, distributing it evenly around the perimeter while the pump is running to help mix it in.
Retest the pH: After allowing the water to circulate for a few hours, retest the pH level to ensure it has reached the desired range. Repeat the process if necessary.
Raising the pH
If the pH level is below 7.2, it’s necessary to raise it. Low pH can cause corrosion of pool surfaces and equipment, and irritate swimmers’ skin and eyes.
Choose a pH Increaser: The most common chemical for raising pH is sodium carbonate (soda ash).
Read the Instructions: Follow the manufacturer’s instructions to determine the appropriate amount to add based on your pool’s volume and current pH level.
Add the Chemical: Slowly pour the soda ash into the pool, distributing it evenly while the pump is running to help mix it in.
Retest the pH: After allowing the water to circulate for a few hours, retest the pH level to ensure it has reached the desired range. Repeat the process if necessary.
Regular Maintenance
Consistent Monitoring: Regularly test the pH levels at least twice a week during the swimming season and adjust as needed.
Balanced Chemistry: Keep other pool chemicals, such as alkalinity, in check, as they can affect the pH balance.
Proper Circulation: Ensure the pool’s pump and filter system is running efficiently to maintain consistent water circulation and chemical distribution.