Use it correctly for optimal maintenance

Sodium bicarbonate is an essential ally for pool maintenance, offering a natural and effective solution to regulate the pH, prevent limescale deposits and ensure optimal comfort for swimmers. Its judicious use helps keep the water clear, healthy and environmentally friendly. In this article we explore best practices for taking advantage of this, drawing on proven methods and key chemical reactions.

The role of pH in swimming pool maintenance

The pH of water is an essential parameter for the health of bathers and for the effectiveness of disinfectants. A pH that is too low (less than 7) or too high (greater than 7.6) can cause skin irritation, equipment corrosion problems or a reduction in the action of treatment products.

Because pH is essential for swimmers’ health

A balanced pH (between 7 and 7.4) prevents eye and skin irritation, preserving the quality of the water. When the pH is too low the water becomes acidic and aggressive for the mucous membranes. On the contrary, a high pH favors the formation of limescale deposits and reduces the effectiveness of chlorine.

The impact of pH on the effectiveness of disinfectants

Chlorine, the main disinfectant of swimming pools, works optimally within a controlled pH range. An abnormal pH reduces its ability to eliminate bacteria and algae, thus increasing the risk of contamination.

Sodium bicarbonate: a natural pH corrector

Sodium bicarbonate (pH+) is used to neutralize a pH that is too low. Its action is complementary to that of automatic regulators, which continuously regulate pH and Redox (ORP) levels.

When to use baking soda?

Sodium bicarbonate is mainly applied in two cases:

• Salt pools : avoid the use of sulfuric acid, which could damage the electrolyser.
• Lining swimming pools : prevents sulphate deposits, keeping the pH stable.

Application and dosage methods

The addition of bicarbonate must be precise to avoid excesses. Here are the key steps for optimal use:

Recommended dosage

The amount of bicarbonate to add depends on the capacity of the pool and the pH difference. In general, we use 50 to 100 g of sodium bicarbonate per 10 m³ of water to correct a slightly low pH. For larger differences it is preferable to proceed with small successive doses, checking the pH after each addition.

Application procedure

1. Measure the pH : Use an electronic tester or test strips to get an accurate reading.
2. Dissolve the baking soda : mix it in a bucket of warm water before pouring it into the pool, avoiding the filtration areas.
3. Wait and check : leave on for 2 to 3 hours, then check the pH again to adjust it if necessary.

Sodium bicarbonate against limescale deposits

Baking soda also plays a key role in preventing limescale, a common problem in hard water regions.

Mechanism of action

When combined with CO₂ (as in water softeners), sodium bicarbonate converts calcium carbonate (CaCO₃) into calcium bicarbonate (Ca(HCO₃)₂), a soluble substance that does not form scale.

Advantages compared to traditional methods

• Conservation of minerals : unlike salt softeners, it does not eliminate calcium and magnesium, which are essential for health.
• Simplified maintenance : No resin or salt replacement is necessary, you only need to renew the CO₂ cylinders every year.

Automatic regulators: an alternative for continuous control

Automated pH controllers offer a complete solution for maintaining optimal chemical balance.

Operation of automated systems

These devices integrate a pH probe, an electronic box and a dosing pump. The probe continuously analyzes the water and triggers the injection of sodium bicarbonate or acid (pH-) as needed.

Advantages of automated systems

• Savings on the product : avoid overdoses and waste.
• Algae reduction : a stable pH limits the proliferation of microorganisms.
• Equipment protection : prevents corrosion of pumps and filters.

Mistakes to avoid when using baking soda

Improper use of baking soda can lead to chemical imbalances that are expensive to correct.

Overdose and underdose

• Overdose : a pH that is too high (>7.6) favors the formation of limescale deposits and reduces the effectiveness of chlorine.
• Underdosing : a pH that is too low (<7) attacks bathers and accelerates the corrosion of materials.

Compatibility with other treatments

Baking soda can react with some chemicals. For example, it is not advisable to mix it with granular chlorine (low pH), because it generates toxic gases. Always favor a separate and controlled application.

Additional maintenance: cleaning surfaces with bicarbonate

Although baking soda is primarily used for water treatment, it can also be used to clean pool surfaces.

Natural cleansing recipe

To remove limescale residues or stubborn stains:

1. Mix 1 tablespoon of baking soda with warm water until a paste forms.
2. Apply to affected areas and leave to act for 15 to 20 minutes.
3. Rub gently with a soft bristle brush, then rinse with clean water.

   : a versatile tool for a sustainable swimming pool

Sodium bicarbonate is a key element for ecological and effective pool maintenance. By regulating pH, preventing fouling and integrating automated treatments, it helps ensure healthy water, durable equipment and long-term cost reduction. To optimize its use, combine it with precise dosing instruments and automated regulation systems, scrupulously following the dosing recommendations.