When it comes to water balance, most owners already know about pH, alkalinity and sanitizers like chlorine or bromine. Yet there are complementary products that can improve water stability and simplify day-to-day maintenance.Borates, often added in the form of sodium borate, are one of these solutions.
Borates do not replace a sanitizer, but they act as an advanced stabilizer that helps keep the water more comfortable and more stable.

Borates are boron-based compounds used at low concentrations in pool or spa water. Their main function is to stabilize the water chemistry, particularly the pH, while improving swimming comfort.

👉 This is an optimization product: it improves balance and stability, but does not sanitize the water.

The main benefit: better pH stability

pH is one of the most important parameters in a pool, but also one of the hardest to keep stable. Borates act as an additional buffer, complementing alkalinity.

Concrete results:

-✔ more stable pH over several days
- ✔ fewer rapid swings
- ✔ fewer corrective products to add
- ✔ simpler, more predictable maintenance

👉 Stable water is easier to manage and helps other products work better.

Softer, more comfortable water

Many owners notice a difference in comfort when the water is properly balanced with borates.

Commonly observed effects:

- silkier water
- a less “harsh” feel
- greater comfort for skin and eyes

This can be especially appreciated in family pools and spas.

An indirect effect on algae

Even though borates are not considered an algaecide in the strict sense, they can help make the environment less favourable to algae growth.

In particular, they help to:

- limit algae growth
- reduce pressure on the sanitizer
- support clearer, more stable water

👉 Important: this is preventive support, not a curative treatment for green water.

Compatibility with pool and spa products

Borates are generally compatible with:

- chlorine
- bromine
- salt water systems
- oxidation treatments (e.g. monopersulfate / active oxygen)

They fit well into an overall maintenance strategy, alongside balancing pH, alkalinity and calcium hardness.

When are borates particularly useful?

Borates can be an excellent choice if:

- the pH rises or falls too often
- the water requires frequent corrections
- the pool is heavily used
- you're looking for more stable, more comfortable maintenance
- you want to reduce swings caused by temperature and sunlight

In many cases, borates are added once per season, then maintained with regular monitoring.

What borates do not do

To avoid any confusion, it is important to note:

- ❌ Borates do not replace chlorine or bromine
- ❌ They do not sanitize the water
- ❌ They do not correct poor basic balance on their own
- ❌ They do not fix cloudy water if sanitization is insufficient

👉 They work as a stabilizer that improves maintenance, but they must be used in water that is already well balanced.

Conclusion

Borates (sodium borate) are an excellent tool for those who want to improve the stability and comfort of their pool or spa water. By helping to stabilize the pH and supporting the water's overall balance, they often reduce constant adjustments and make for more pleasant water every day.

Used as a complement to regular maintenance, borates contribute to water that is more stable, clearer and easier to manage over the long term.