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Hydrochloric acid (also known as pool acid or muriatic acid) is used to lower the pH and reduce Total Alkalinity in swimming pools and spas. Keeping pH in the correct range ensures your chlorine works properly, the water feels comfortable, and protects equipment and surfaces.

Why pH matters

If the pH is too high, the pool water becomes less effective at sanitising, can turn cloudy, and scale may form. Hydrochloric acid brings the pH back into balance.

What hydrochloric acid does

  • Reduces high pH levels
  • Lowers Total Alkalinity
  • Helps prevent scale forming on pool surfaces and equipment
  • Improves chlorine efficiency

Where we use it

We use hydrochloric acid during our water test & balance and valet services to keep your pool or spa within the ideal pH range of 7.2–7.6.

Safe handling

Hydrochloric acid is a corrosive chemical, so please:

  • Store in an upright position in a cool, well-ventilated place
  • Keep away from children and pets
  • Never mix with chlorine or other chemicals
  • Add acid to water — never water to acid

AVAILABLE IN STORE ONLY

5L Hydrochloric Acid - pH decrease (liquid).

Hydrochloric acid (also known as pool acid or muriatic acid) is used to lower the pH and reduce Total Alkalinity in swimming pools and spas. Keeping pH in the correct range ensures your chlorine works properly, the water feels comfortable, and protects equipment and surfaces.

Why pH matters

If the pH is too high, the pool water becomes less effective at sanitising, can turn cloudy, and scale may form. Hydrochloric acid brings the pH back into balance.

What hydrochloric acid does

  • Reduces high pH levels
  • Lowers Total Alkalinity
  • Helps prevent scale forming on pool surfaces and equipment
  • Improves chlorine efficiency

Where we use it

We use hydrochloric acid during our water test & balance and valet services to keep your pool or spa within the ideal pH range of 7.2–7.6.

Safe handling

Hydrochloric acid is a corrosive chemical, so please:

  • Store in an upright position in a cool, well-ventilated place
  • Keep away from children and pets
  • Never mix with chlorine or other chemicals
  • Add acid to water — never water to acid

AVAILABLE IN STORE ONLY

Poolcare

5L Hydrochloric Acid - pH decrease (liquid).

$38.00
Sale price: $38.00 Regular price:
Shipping calculated at checkout.

Quantity

Onsite Testing

Price: $36-$41 (plus any additional chemicals) for the Tauranga area. An additional mileage charge may apply for locations outside Tauranga.

Shop Water Testing (Free of Charge) You can also bring a water sample to our shop for testing free of charge providing you are getting your chemicals from us.

Our onsite testing service includes:

  • Testing and balancing your pool water.
  • Clearing skimmer and pump baskets.
  • Backwashing the filter.
  • Checking over the entire pool system.

We’ll leave a detailed pool service report on-site, showing the water test results and any recommendations we have for keeping your pool in top condition. You can choose to use your own chemicals, or we can provide high-quality products to get the job done.

Shop Water Testing Guidelines

If you prefer to bring a water sample to our shop for testing, please make sure to:

  • Use a clean container (not metal) to collect the sample.
  • Take the sample from at least 400mm below the water surface to ensure an accurate representation of your pool's water quality.