How Boric Acid Makes Pool Water Easier to Manage
We don’t sell boric acid — so this isn’t a sales pitch. Boric acid is a game changer for pool owners because it acts as a powerful supplement to pool chlorine and buffer, helping stabilise water chemistry and make your pool water balance easier to maintain.
Boric acid helps:
✔ Reduce rapid pH rise
✔ Improve water clarity
✔ Make water feel softer
✔ Reduce scale formation risk
✔ Lower maintenance effort
✔ Less risk of pool staining
Here’s the most amazing benefit for pool water. Boric acid is a mild acid, so it gently lowers pH which reduces how much hydrochloric acid you need to keep your pH balanced. On the other hand, Buffer is alkaline, so it raises pH! Remember, in every pool, pH naturally drifts upward, especially in salt water chlorinated pools. So using a mild acid like boric acid works to keep your pH in the ideal range for longer and reduces ‘pH bounce’.
Maintaining proper pH is one of the best things you can do for your pool. When pH is off balance, the consequences show up quickly. These include skin and eye irritation, calcium scaling on pool surfaces, staining, and reduced chlorine effectiveness. Boric acid helps prevent those pH swings before they become a problem.
Borates Stop The pH Bouncing
A common complaint we hear from pool owners is the ‘pH see-saw.’ They are told to add buffer (Alkalinity Up) to their water, which also raises the pH. To correct the pH, they are told to add acid (which lowers the alkalinity). Then the pool shop recommends more buffer which raises the pH. It’s insane. This repetitive cycle is why you need for a more stable chemical approach.
Why Use Boric Acid in your Pool?
Here is a summary of the benefits for using boric acid in your swimming pool.
pH Stability — Reduced Acid Usage
One of the most significant benefits of borates is how well they buffer (regulate) pH movement. Borates help prevent pH from creeping upward, which is common frustration pool owners constantly face. Borates help keep pH steady, which means fewer adjustments and less hydrochloric acid use over time, especially if you have a salt pool. Borates are very helpful because salt chlorination naturally push pH higher, and borates help reduce some of that rising pH pressure.
Algae Resistance – Not a Killer — a Deterrent)
Borates work as an algaestat, they make it harder for algae to get a foothold in your pool). Borates interfere with algae’s ability to reproduce and use nutrients, making the water less hospitable for new algae blooms. This means reduced chlorine demand (often 30–50% less) because your chlorinator is now getting extra help from the borates to stop algae growth.
Chlorine Efficiency
With a more stable pH and reduced demand on your chlorine, your free chlorine simply works better and lasts longer. Many pool owners who use borates find they’re adding less chlorine overall and spending much less on chemicals. In some cases, they are even running their pump and filter for shorter periods.
Water Feel and Comfort
While this is subjective, water treated with borates tends to feel softer and silkier, look clearer, and cause less eye irritation and dry skin after swimming. Pool owners often comment about this in online forums. Stable water chemistry means reduced eye and skin irritation, softer feeling water, less chlorine smell and much more The overall balance borates help maintain saves you money at the pool shop.
Boric Acid Benefits at a glance
| Feature | Sodium bicarbonate (buffer) | Boric acid (borates) |
|---|---|---|
| Primary effect | Raises total alkalinity & pH | Stabilises pH & resists drift |
| pH stability | Moderate | Strong — especially against rising pH ✓ |
| Green / Black Spot Algae resistance | None ✗ | Inhibits algae growth (algaestat) ✓ |
| Chlorine demand | No reduction | Reduces demand 30–50% ✓ |
| Water feel | Neutral | Softer, silkier — less skin & eye irritation ✓ |
| Cost | Very low ✓ | Higher upfront investment |
| Best use | Quick alkalinity corrections | Ongoing water stability & easier maintenance |
| Drawbacks | Requires regular top-ups ⚠ | Risk of overdosing; test before adding ⚠ |
How to add Boric Acid to your pool?
If you decide to use boric acid in your pool, the process of adding it is easy.
Step One: Before doing anything, test and balance your water first. pH, alkalinity, and chlorine should all be in the correct range before you add boric acid.
Step Two: The target range for borates is 30–50 ppm. You can enter your pool volume into our free calculator below and it will tell you the exact amount of boric acid needed for your pool.
Step Three: Dissolve the powder completely in a bucket of water and then pour the solution slowly around the pool while your pump is running. Good circulation helps distribute it evenly throughout the water. It is best to add gradually over a few days rather than add it all at once.
Step Four: Do not overdose your pool thinking it will work even better. Very high borate levels are not healthy for swimmers.
Step Five: Your pool shop can test your borate levels and help you keep them in the right range. Remember that unlike buffer, borates don’t evaporate. So, once your pool is dosed to the right level, it typically stays there. Splash-out and backwashing are the main reasons levels drop over time, so top-ups are occasional – usually every 6-9 months.
Wait...Has this all been properly tested?
The benefits of boric acid in swimming pools isn’t just pool-owner urban legend — it’s been researched and tested at the university level. For example, Dr. Robert Birch at the University of Queensland examined borates as a secondary pH buffer and algaestat, and his published and peer reviewed findings support what many experienced pool owners already know from experience.
At concentrations of 30–50 ppm, borates were found to help prevent pH drift without meaningfully impacting the Langelier Saturation Index (LSI) — an important consideration for anyone who wants to protect their pool surface and prevent scale formation. His research also found that saltwater pools benefited most, given how quickly pH tends to climb in salt water pools.
Beyond water chemistry, Dr. Birch’s work also looked at swimmer experience. Improved water clarity, reduced eye irritation, and greater overall comfort were all noted outcomes — consistent with what pool owners have reported for years.
In September 2018 the Association of Pool & Spa Professionals also investigated the current research into borates in swimming pools and published their findings online.
On the safety side, the study confirmed that borate levels in the 30–50 ppm range fall well within World Health Organization (WHO) guidelines, giving pool owners confidence that this isn’t a case of trading chemistry stability for swimmer safety.
Boric Acid saves you money
Some pool owners are tired of constantly adding acid, then buffer, then more acid going around and around. If you’re constantly chasing pH, dealing with recurring algae, or adding tons of chemicals to stay on top of water maintenance, boric acid is worth serious consideration. It offers stronger pH buffering than buffer and reduces the risk of calcium scaling, reduces overall chemical demand, and makes it significantly harder for algae to bloom in your pool water. Borates won’t replace your regular maintenance, but it does make it much easier, and cheaper, to manage.
If green algae keeps coming back no matter what you try, borates may be the missing piece. Rather than constantly reacting to problems, boric acid helps create conditions where those problems are less likely to start in the first place. It can be a lifesaver for frustrated pool owners who are always battling a green pool.
Boric Acid Safety Considerations
Boric acid is safe when used as directed. However, it is important to take some safety precautions when handling it and adding it to your pool.
- Wear gloves and eye protection when handling.
- Do not ingest boric acid – if you do, call poison control or seek medical attention
- Keep boric acid contained and out of reach of children and pets.
- If you get boric acid in your eyes, flush them with water for 15 minutes.
- Don’t overdose your pool with large amounts as this can be harmful to swimmers.
- If your pets drink pool water on a daily basis, this treatment is not recommended.
Boric Acid Dosage Calculator
Boric Acid Dosage Calculator
Find out exactly how much boric acid your pool needs to reach the ideal 40 ppm borate level.
Not sure? A typical backyard pool is 40,000–80,000 litres.
Enter 0 if untreated.
Recommended: 40 ppm.
Frequently Asked Questions
Is boric acid safe for my pets and children?
Yes, when used correctly. At the recommended concentration of 30–50 ppm (parts per million), boric acid is considered safe for swimmers and pets. To put it in perspective, this concentration is significantly lower than what is found in many common household products. However, you should always store the raw, concentrated powder in a secure location out of reach of children and pets, and wait at least 30–60 minutes after application before allowing anyone to swim to ensure it has fully dissolved and circulated.
Is boric acid the same as borates?
Not exactly. Boric acid is one way to add borates to pool water, and borates are the chemistry that helps with buffering once dissolved. In simple terms, boric acid is the product you add, while borates are the benefit you get. There are 3 most common products that add borates to your pool. Boric acid, Sodium tetraborate, Sodium tetraborate pentahydrate.
How often do I need to add boric acid to my pool?
The beauty of borates is that they do not evaporate or break down over time. Unlike chlorine, which is “consumed” by sunlight and organic matter, borates only leave your pool through “water loss”—such as backwashing, splashing, or draining the pool. Most pool owners only need to “top up” their borate levels once a year or after significant rainfall and draining. We recommend testing your levels every 6 months to ensure you’re still in the “sweet spot” of 30–50 ppm.
Can I use borates in a salt water pool?
Absolutely—in fact, salt pools benefit the most. Saltwater chlorinators naturally cause the pH of your water to rise due to the process of electrolysis. By adding boric acid, you create a chemical buffer that resists this rise, keeping your pH stable, protecting your equipment from scale, and allowing your salt cell to work more efficiently.
What Boric Acid Does Not Do
Boric acid acts as a secondary buffer, not as a complete replacement. Even with the right borate level in your pool, you may occasionally still need a small dose of buffer to bring total alkalinity back into range. Think of borates as a stabilising layer on top of your existing chemistry. Boric acid is not a substitute for water maintenance or chlorine.
✔ Does NOT replace the need for chlorine
✔ It does NOT fix bad water balance
✔ It does NOT remove exisiting calcium scale
✔ It does NOT kill exisiting algae
✔ It will NOT remove exisiting pool stains
Still Got Questions?
Feel free to contact us if you have any questions or comments about boric acid. We can also help you with calcium formation, algae growth and pool stains. We would love to hear from you.
References Cited
Birch, R (2015) Boric Acid as a Swimming Pool Buffer, University of Queensland. (Version 3 -2015)
https://poolchemistrytraininginstitute.com/guide-to-borate-for-pools/
https://www.borax.com/BoraxCorp/media/Borax-Main/Resources/Brochures/borates-swimming-pools.pdf
https://www.phta.org/pub/?id=2eadc5da-1866-daac-99fb-c832de9556fc
https://www.who.int/docs/default-source/wash-documents/wash-chemicals/boron-chemical-fact-sheet.pdf?sfvrsn=a936384f_4
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