When a pool water test shows a low pH, baking soda can seem like the easiest solution. It is inexpensive, widely available in Canada, and familiar to most homeowners. But before adding a scoop to your pool, it is important to understand what baking soda actually does.
Baking soda, or sodium bicarbonate, can increase both total alkalinity and pH. However, its main role in pool care is to increase total alkalinity, while its effect on pH is relatively mild. If your pH is significantly below the recommended range, baking soda may not be the quickest or most appropriate product for correcting the problem.
For most residential pools, Health Canada references a pH range of 7.2 to 7.8 and a total alkalinity range of 100 to 120 ppm in its guidance for pool and spa products. Health Canada also recommends testing pool water regularly for sanitizer levels, pH, total alkalinity and calcium hardness.
So, if your test shows low pH, the first step is not simply to add baking soda. Test both pH and total alkalinity so you know which part of the water balance needs attention.
Does Baking Soda Raise Pool pH?
Yes, baking soda can raise pool pH, but its effect is relatively mild. Baking soda, or sodium bicarbonate, is mainly used to increase total alkalinity, which helps stabilize pH and reduce sudden changes in water chemistry.
If your pool pH is slightly below the recommended range and total alkalinity is also low, baking soda can be a useful option because it addresses both issues. However, if the pH is significantly low while total alkalinity is already within the proper range, baking soda is usually not the best choice. A dedicated pH increaser, such as soda ash, is designed to raise pH more effectively.
Before adding anything, test both pH and total alkalinity. This simple step helps you determine whether your pool needs more alkalinity, a stronger pH adjustment, or no chemical addition at all.
When Should You Use Baking Soda in a Pool?
Baking soda is most useful when your pool's total alkalinity is low. Because sodium bicarbonate primarily increases alkalinity, it can help the water resist rapid pH changes and maintain a more stable balance.
You may also consider baking soda when both pH and total alkalinity are slightly low. In this situation, increasing alkalinity can provide some upward movement in pH while addressing the underlying alkalinity issue.
Another common use is maintaining more stable pool water chemistry. If your pH tends to fluctuate, checking total alkalinity can help determine whether low alkalinity is contributing to the problem.
Baking soda can also be useful when you want to increase alkalinity without sharply increasing pH. Its effect on pH is relatively mild compared with products specifically designed to raise pH.
The key point is simple: do not add baking soda just because your pH reading is low. Test total alkalinity first. If alkalinity is already within the appropriate range, adding more baking soda may raise alkalinity unnecessarily without being the right way to correct the pH.
How to Raise Pool pH with Baking Soda
If testing shows that baking soda is appropriate for your pool, follow a controlled approach rather than adding it by guesswork.
- Test the water first. Check both pH and total alkalinity to understand what needs to be adjusted.
- Determine your pool volume. You need an accurate estimate of the amount of water in the pool before calculating the required chemical dose.
- Check the manufacturer's dosage instructions. Different products can have different recommendations, so use the instructions provided for the baking soda you are using.
- Measure the required amount. Avoid adding a large amount simply because the pH appears low. Gradual adjustments make it easier to control the water chemistry.
- Add the baking soda as directed. Distribute it evenly according to the product instructions rather than concentrating it in one area.
- Allow the pool water to circulate. Give the chemical time to mix thoroughly before testing again.
- Retest before making another adjustment. Check pH and total alkalinity again, then decide whether another adjustment is necessary.
When handling pool chemicals, follow the product label and basic safety instructions. Keep chemicals stored in their original containers and away from children and pets. Never mix pool chemicals together unless the manufacturer specifically says they can be combined.
How Much Baking Soda Should You Add to a Pool?
There is no single amount of baking soda that works for every pool. The correct dosage depends on pool volume, current total alkalinity and the target alkalinity level.
Pool size alone is therefore not enough to determine how much baking soda you need. Two pools with the same water volume can require different amounts if their starting alkalinity readings are different.
The safest approach is to:
- Test the current total alkalinity.
- Confirm the pool's approximate water volume.
- Check the baking soda manufacturer's dosage guidance.
- Measure the recommended amount accurately.
- Make the adjustment gradually.
Allow the water to circulate and retest before adding more.
For example, if a product label states how much sodium bicarbonate is required to increase alkalinity by a specific number of ppm in a specific volume of water, use that dosage as the basis for your calculation. Do not rely on a generic “cups per 10,000 gallons” formula unless it comes from a reliable product or pool chemistry source.
This gradual approach is particularly helpful during pool opening season in Canada, when water chemistry may need several adjustments after winter. Rather than trying to correct everything at once, test, adjust and retest until the water reaches the appropriate balance.
Baking Soda vs. Soda Ash for Pool pH
Baking soda and soda ash can both affect pool pH, but they are not interchangeable. The right choice depends on your test results, particularly your total alkalinity level.
| Baking Soda | Soda Ash | |
|---|---|---|
| Main purpose | Raise total alkalinity | Raise pH |
| Effect on pH | Mild increase | Stronger increase |
| Best used when | Total alkalinity is low | pH is low but alkalinity does not need a significant increase |
| What to check first | pH and total alkalinity | pH and total alkalinity |
Baking soda is generally the better option when your pool needs more total alkalinity and you also want a relatively small increase in pH. Soda ash is more suitable when the main issue is low pH and your alkalinity is already at an appropriate level.
Instead of choosing based on the product name alone, test your pool water first. This helps prevent raising total alkalinity too much when the actual problem is simply low pH.
What to Check After Adding Baking Soda
After adding baking soda, give the pool water enough time to circulate and mix before testing again. Then check both pH and total alkalinity.
Confirm that the readings are back within the appropriate range for your pool and the treatment system you are using. If the numbers are still outside the desired range, make another adjustment only according to the relevant product guidance.
Avoid repeatedly adding chemicals without retesting. If pH or alkalinity continues to change unexpectedly, consider recent chemical additions, water replacement, dilution from rain or other changes in the pool's water balance.
Common Mistakes When Raising Pool pH
Several simple mistakes can make pool water harder to balance:
- Confusing pH with total alkalinity: They are related, but they measure different aspects of water chemistry.
- Adding too much baking soda at once: A large addition can push total alkalinity higher than intended.
- Skipping the initial water test: Without knowing both pH and alkalinity, it is difficult to choose the right treatment.
- Using baking soda for every low pH problem: Baking soda may not be appropriate when alkalinity is already adequate and pH needs a stronger increase.
- Testing too soon: Allow the water to circulate before checking the results again.
- Adding multiple chemicals together: Follow each product's instructions and avoid mixing pool chemicals unless the manufacturer specifically permits it.
The goal is not simply to make the pH number rise. The goal is to bring the pool water into a balanced range without creating a new chemistry problem in the process.
Can You Swim After Adding Baking Soda?
Whether you can swim after adding baking soda depends on the pool's current chemical readings and the instructions for the product you used. There is no single waiting time that applies to every pool.
After adding baking soda, allow it to circulate according to the product instructions, then retest the water. Check the pH and total alkalinity to make sure they are within the appropriate range for your pool system before swimming.
Always follow the product label and any guidance provided by your pool manufacturer or service professional. If you have added other pool chemicals at the same time, check the instructions for those products as well.
The safest approach is simple: test first, adjust carefully, circulate the water, and confirm the readings before getting back in the pool.
Keep Your Pool Area Cleaner with MOVA
Balancing pool water is only one part of keeping an outdoor space ready for summer. The area around the pool often needs attention too. Grass clippings, leaves, sand and other outdoor debris can quickly collect on the pool deck and nearby living areas.
This is where a robot vacuum can help with the cleaning work around your home. Rather than using a robot to clean or treat pool water, you can use a suitable MOVA robot vacuum for compatible indoor surfaces to help keep the areas connected to your outdoor space cleaner.
When choosing a MOVA model, check its product specifications to make sure it is designed for the floor type and cleaning conditions where you plan to use it. For the latest features and supported surfaces, visit the relevant MOVA product page.
Final Takeaway
Baking soda can be useful for pool maintenance, but it is primarily an alkalinity increaser, not a strong pH increaser. While it may raise pH slightly, it is not always the right choice when pH is significantly low.
Before adding anything, test both pH and total alkalinity. Use those results to determine which adjustment your pool actually needs.
Make gradual adjustments based on your pool volume and the product manufacturer's instructions, then allow the water to circulate and retest. Avoid relying on a generic dosage or adding more chemicals simply because the first test does not immediately show the desired result.
The goal is not simply to push the pH number higher. It is to maintain stable, balanced pool water that stays within the appropriate range for your pool system.
FAQs
Does baking soda raise pool pH?
Yes, baking soda can raise pool pH slightly, but its primary purpose is to increase total alkalinity. If pH is significantly low, a dedicated pH increaser may be more appropriate.
Is baking soda the same as a pool pH increaser?
No. Baking soda is sodium bicarbonate and is mainly used to increase total alkalinity. Pool pH increasers, such as soda ash, are intended to raise pH more effectively. They should not be treated as interchangeable.
How much baking soda should I add to my pool?
The amount depends on your pool's water volume and current total alkalinity. Check the product's dosage instructions and make gradual adjustments rather than using a generic formula. Retest the water before adding more.
Should I raise pool pH or alkalinity first?
It depends on your test results. If total alkalinity is low, correcting alkalinity may be the appropriate first step. If alkalinity is already within the desired range but pH is low, a product intended specifically for raising pH may be more suitable.
How long should I wait to test my pool after adding baking soda?
There is no universal waiting time for every product or pool. Allow the water to circulate according to the product instructions, then retest pH and total alkalinity. Always follow the manufacturer's directions before making another adjustment.