(25KG/DRUM DILUTED HCL 9%) x 3 units


Hydrochloric (Muriatic) Acid, also referred to as HCl is used for lowering pH in Pool Water. Maintaining proper water chemistry in your pool is essential for health and safety. One of the most common pool chemicals is hydrocholoric acid, often known as muriatic acid. It is a very strong acid used to lower the pH or total alkalinity of the water. It can also be used as an acid washer for cleaning an empty pool.

All pool chemicals do have a shelf life, but for some, the shelf life is so long that most people will use up the chemicals they buy long before they expire. As a general rule, liquid acids and other dry pool chemicals can last for several years if they're properly stored away from heat and moisture.  Hydrochloric Acid could have 5 years or more shelf life, however pH decreasers are acids, and a larger shelf life concern about pH decreasers is the strength of the container.

The most desired pH of pool water is between 7.2 to 7.6, slightly basic. This is the most comfortable range for your eyes and skin, and provides the optimum chlorine levels to prevent bacteria, algae and fungus growth, without developing scale, the white crusty substance often seen on pool tiles, or becoming too corrosive. Hydrochloric acid is often used to adjust pool water back towards this optimum range when it has become too basic.

Test pH weekly. The recommended range is between 7.2 and 7.6. If the pH is higher than 7.6, correct it by adding the Hydrochloric (Muriatic) Acid 10% as shown on the following table:

Never add Hydrochloric Acid when people are in the pool.

Approximate amounts of Hydrochloric (Muraitic) Acid 9% - 10% used

when the pH is high.

Volume of Pool Water (Lt)



pH Grading

7.2 – 7.6




Do Not

Use Acid

Recommended Range

350 ml

420 ml


1 L

1.2 L


1.7 L

2 L


3.5 L

4 L



This depends on just how high the pH is and the size of the pool. The amount calculations are not exact. It is always best to add less than the full amount, wait a little while to allow the addition to mix thoroughly, and then retest to see where you are. If you have a smaller pool, or an above-ground pool, you would start with one cup of acid, and then re-test and add more if needed. 

General Instructions

  • When adding Hydrochloric (Muriatic) Acid ensure that the product is mixed thoroughly with water remembering to always add acid to water, never add water to acid.
  • Apply the mixed chemical to the surface of the pool water.
  • Allow 2-3 hours mixing with the filter running before measuring pH again. Carry out minor adjustments as necessary. 
  • Store in an upright and secure position in a cool, well ventilated place. Keep out of reach of children.
  • Make sure you read all the instructions on the label.

Tips on Lowering your Swimming Pool pH

  • Never pour any chemicals into your skimmer filter basket (if you have one).  The water here goes directly to your expensive pool pump, filter, heater, and other equipment.
  • If pH is really low, test strips and even test kits cannot test higher than a pH of 8.6.  If this is the case, you will need to add a significant amount of pH reducer or muriatic acid to bring that pH value back down to testable levels.  Once you can test pH, then you can fine tune how much more you need to reduce the pH.  


  • Muriatic acid is caustic.  If you get it on your skin it will burn.  Wear goggles, gloves, long sleeve shirt, and heavy jeans.  Have a bucket of water and a hose with a sprayer attached with the water already turned on, ready to hose yourself or anything else off if you spill.   If you do manage to dump it on yourself, wash it off immediately.
  • Do not spill muriatic acid on any concrete, tile, or any other masonry.  I cannot stress this enough.  If any of you have sealed your garage floor with epoxy based floor covering, a recommended step prior to applying the epoxy is to apply undiluted muriatic acid to the garage floor.  This etches the concrete so the epoxy will stick, giving off bluish green fumes that rise off the concrete, plus some bubbling and fizzing that also occurs.
  • When working with muriatic acid over concrete, you can try to pre-wet the concrete with water to help with diluting any potential spills or drops that might end up on the concrete.
  • You typically want to dilute the muriatic acid in a bucket of water to prevent burning yourself, pool surfaces, or equipment.  Some muriatic acid containers come pre-diluted so you don’t have to mix with water and you can just apply directly to the pool.
  • Although it may seem crazy to put such a damaging liquid into your swimming pool water, even strong acids like this one are beneficial in small doses.


Product: Pool pH Decreaser 

Chemicals: Diluted HCl 9% With Additive (Hydrochloric Acid or Muriatic acid)

Batch: December 2017

Weight: 25kg per drum  

Quantity: Total 3 drums

Pool Chemicals Delivery is not available for East Malaysia (Sabah/Sarawak) addresses.

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Pool pH Decreaser - Diluted HCl 9% With Additive (25kg/Drum Hydrochloric or Muriatic Acid) x 3 units - [PROMO COMBO]

  • Product Code: AC0015
  • Availability: 48
  • RM555.00
  • RM275.00

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Tags: Hydrochloric Acid, HCL, Swimming Pool Chemicals, pH, Muriatic

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