How to Fix Pool Water That’s Too Acidic

Maintaining a balanced pool is crucial for ensuring a clean, safe, and comfortable swimming environment. One of the most important factors in pool water chemistry is the pH level. If the pH of your pool water is too low, it means the water is acidic, which can lead to a variety of problems such as corrosion of pool surfaces, discomfort for swimmers, and ineffective sanitization. In this blog post, we will guide you through the process of fixing pool water that’s too acidic, how to test your pool’s pH, and how to keep your pool balanced for optimal performance.

Why Pool Water Becomes Too Acidic

There are a few reasons why pool water may become too acidic. The pH scale measures the acidity or alkalinity of the water, with 7 being neutral. A pH below 7.0 indicates acidic water, which can cause damage to your pool and its equipment. Below are common reasons for acidic pool water:

Rainfall: Heavy rain can dilute pool chemicals and lower the pH, making the water more acidic.
High Chlorine Levels: Overuse of chlorine or chlorine-based chemicals can increase the acidity in pool water.
Inadequate Alkalinity: Low alkalinity in your pool water can make it harder to maintain proper pH levels, causing the water to become too acidic.
Excessive Pool Usage: A high volume of swimmers can lower the pH as swimmers introduce body oils, sweat, and other contaminants that affect water balance.

Why Acidic Pool Water is Problematic

Acidic pool water can cause several issues, not only for your pool but also for swimmers and pool equipment:

Corrosion: Low pH levels can cause corrosion of metal components like ladders, handrails, and pool heaters, leading to costly repairs.
Staining: Acidic water can cause staining on pool surfaces, tiles, and the pool’s plumbing.
Skin and Eye Irritation: Acidic water can irritate swimmers’ skin and eyes, making swimming uncomfortable and unsafe.
Ineffective Sanitization: Pool chemicals, especially chlorine, are less effective at low pH levels, meaning the pool may not be properly disinfected.
Damage to Pool Equipment: Prolonged exposure to acidic water can damage filters, pumps, and other pool equipment, leading to more frequent repairs.

How to Test for Acidic Pool Water

To fix acidic pool water, the first step is to test the pH level. Testing allows you to assess the severity of the problem and determine how much adjustment is necessary.

1. Using Pool Test Strips

Pool test strips are an easy and affordable way to check the pH of your pool water.

Step 1: Dip the test strip into the pool water for about 5 seconds.
Step 2: Remove the strip and shake off any excess.
Step 3: Wait for the color to change on the strip and then compare it to the chart provided with the strips.

Advantages: Test strips are quick and easy to use, making them a great choice for quick checks.

Disadvantages: They may not be as precise as liquid tests, and the colors can sometimes be difficult to interpret.

2. Using a Liquid Test Kit

Liquid test kits provide more accurate results and are recommended if you want a precise reading of your pool’s pH.

Step 1: Fill the test tube with a sample of pool water (typically 5 mL).
Step 2: Add a few drops of the pH reagent as per the kit instructions.
Step 3: Swirl the test tube and compare the color of the solution to the provided color chart.

Advantages: Liquid test kits offer a highly accurate reading and are great for more in-depth testing.

Disadvantages: They take more time to use than test strips and may require additional tools like a dropper or test tube.

3. Using a Digital Tester

A digital tester is another accurate option for checking your pool’s pH.

Step 1: Fill the testing chamber of the digital tester with a sample of pool water.
Step 2: Turn the tester on and follow the instructions for a quick reading.
Step 3: The digital display will show the pH level.

Advantages: Digital testers are precise, fast, and easy to use.

Disadvantages: They are generally more expensive and require batteries or charging.

How to Raise the pH of Your Pool

If your pool water is too acidic, the pH is too low, and you will need to raise it to bring the water back into the ideal range (7.4 to 7.6). Here are the steps to raise the pH of your pool.

1. Test and Determine pH Level

Before adding any chemicals, test your pool’s pH level to determine how much adjustment is needed. Aim for a pH between 7.4 and 7.6.

2. Use Sodium Carbonate (Soda Ash)

Sodium carbonate, commonly known as soda ash, is the most effective chemical for raising pool pH.

Step 1: Read the manufacturer’s instructions for the appropriate amount of soda ash based on your pool’s size.
Step 2: Slowly add the soda ash to the pool, spreading it evenly around the edges or across the surface of the pool.
Step 3: Use the pool pump to circulate the water and dissolve the soda ash.
Test Again: After a few hours, retest the alkalinity to ensure it has reached the desired range (80-120 ppm).

3. Use Baking Soda for Alkalinity Adjustment

While soda ash is used to raise pH, baking soda can help improve alkalinity, which helps stabilize the pH. Low alkalinity often causes pH to drop.

Step 1: Calculate the amount of baking soda needed for your pool size.
Step 2: Sprinkle the baking soda around the pool, particularly near the return jets.
Step 3: Allow the pool filter to run for several hours to mix and dissolve the baking soda.

4. Avoid Over-Adding Chemicals

It’s important to add chemicals gradually. Adding too much soda ash or baking soda at once can result in overshooting the ideal pH range, causing the water to become too alkaline.

How to Prevent Pool Water From Becoming Too Acidic

Once you’ve adjusted your pool’s pH, it’s important to take steps to prevent it from becoming too acidic again. Here are some tips for maintaining a balanced pool:

Maintain Proper Alkalinity: Ensure that your pool’s alkalinity is within the recommended range (80-120 ppm). This helps buffer pH fluctuations and keeps the water stable.
Regular Testing: Test your pool’s pH at least once a week during the swimming season to catch any imbalances before they cause major issues.
Monitor Chemical Levels: Be cautious about adding excessive amounts of chlorine, acid, or other chemicals, as they can impact pH and alkalinity levels.
Use Pool Covers: Using a pool cover when the pool is not in use can reduce the amount of debris and contaminants entering the pool, which can affect the pH level.
Limit Heavy Pool Use: High swimmer volume can lower pH and introduce contaminants. Avoid overuse of your pool, and maintain regular cleaning and chemical balancing.

Additional Tips for Maintaining a Balanced Pool

Here are some additional pool maintenance tips to help prevent low pH levels and maintain a balanced, clean, and healthy pool:

Ensure Proper Water Circulation: Good circulation helps distribute chemicals evenly throughout the pool, which helps prevent pH fluctuations.
Regular Skimming: Regularly skim debris from the pool’s surface to prevent the buildup of contaminants that can affect water balance.
Clean Your Pool Filter: A dirty or clogged filter can cause the pool’s pH and chemical balance to become unbalanced. Clean and backwash the filter regularly.
Keep Pool Equipment in Good Condition: Ensure that all your pool equipment, such as the pump and heater, is in good working order to maintain proper circulation and water quality.