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Hydrochloric Acid 5L


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Reduces the pH in pool water, improves clarity and improves the effectiveness of chlorine.
Cleans and etches bricks and concrete.
Metal processing.
In stock

Available nationally however we do exclude some remote and regional areas, for these areas contact your local store for delivery options. Standard delivery terms apply, calculated at checkout.

ACT, NSW & VIC: Free deliveries for online orders over $100 and under 40kg. Limited time only.

Local deliveries, DIY only, excludes trade sales. Find out more about our Delivery policy.

Collect from one of over 400 Mitre 10 or True Value Hardware stores across Australia. Check stock availability online. The store will contact you when the order is ready.

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  • pH Adjustment in Swimming Pools
  • Brick Cleaning and Concrete Etching
  • Industrial processes
  • Mineral Processing
  • Metal Preparation
Brick Cleaning and Etching
1. Remove lumps of concrete with a scraper. Wet bricks thoroughly with water.
2. Mix 1 part Acid with up to 10 parts water.
3. Apply Acid solution with a broadbrush and rinse off with water once chemical reaction (frothing) has ended.

pH adjustment in Swimming Pools
1. Add 100ml of Acid per 40,000L of water to lower pH by 0.1 on the pH scale i.e. 7.9 to 7.8
2. Run pool pump for at least 1 hour after adding the Acid. Retest and adjust after 8 hours running.

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Local Deliveries

Many Mitre 10 stores offer a local delivery service. Contact your local store about what options you have for local delivery.


This Policy is provided by the Mitre 10 store participating in this website that has been selected by the customer to buy the particular product/s that are subject to this Policy (Store). The Store is not required to provide a refund or replacement if the customer changes their mind. But the customer can choose a refund or exchange if a product has a major problem. View the Full Return Policy.

What you need to know before purchasing

  • Not all stores carry stock of this product, but will order it in for you. 
  • Please allow up to 14 days for stock to arrive at your selected store.
  • Products are available while stocks last.
  • Contact your local store to check stock availability.
  • Images are for illustration purposes only.
  • Price is available to online purchases only.
  • Price when purchasing in-store may vary.

Many of our products come with a guarantee or warranty from the manufacturer. In addition, they come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any further reasonably foreseeable loss or damage. You are entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. Full details of your consumer rights may be found at