15 g per m³ raises pH by approximately 0.2. Re-test before dosing again.

Will it raise alkalinity too?

Yes, by about 4 ppm per 15 g per m³. Account for that when correcting both at once.

Can I use baking soda instead?

No. Baking soda (sodium bicarbonate) raises alkalinity but does not lift pH meaningfully.

How long does a pack last?

5 kg lasts a typical 40 m³ pool around 6 months of weekly correction.

Yes, the same sodium carbonate used in baking and detergent industries; 99.5% pure.

What is the active ingredient?

Sodium carbonate (Na2CO3) at 99.5% purity.

How does it differ from sodium bicarbonate?

Soda ash raises pH and TA both; bicarbonate raises only TA. Use carbonate for pH, bicarbonate for TA.

Why is alkalinity important here?

Total alkalinity is the buffer that holds pH steady. Without it, every dose bounces back.

Alkalinity is too low; raise TA first to 80-120 ppm, then correct pH.

Run filtration 12 hours; calcium precipitates briefly then settles.

pH Plus (soda ash) raises pH; pH Minus (sodium bisulphate) lowers it. Use one or the other, never both at once.

Soda ash vs sodium hydroxide?

Soda ash is the safe, slow buffer; caustic soda is faster and more aggressive but burns skin and overshoots easily. Choose soda ash for routine pool work.

Pool pH Plus - Sodium Carbonate

Name: Pool pH Plus - Sodium Carbonate
Brand: ClearSpa
SKU: pb-1
Availability: InStock
Rating: 4.5 (6 reviews)

Sodium carbonate (soda ash) for raising pH in swimming pools. The standard food-grade buffer that lifts pH 0.2 per 15 g per m³ without disturbing chlorine or hardness.

Raises pH approximately 0.2 per 15 g per m³.
Buffers chlorine into the active hypochlorous form.
Stops corrosion of metal heaters and rubber seals at low pH.
Cuts swimmer eye and skin sting from acidic water.
Sustains alkalinity above 80 ppm so pH does not bounce.