Swimming Pool Chemicals - pH Minus Powder

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  • pH Minus
  • Decreases the pH level in pool and spa water.
  • Promotes bather comfort, chemical efficiency and protection of pool & spa equipment
  • Ideal pH level is between 7.2 - 7.6
  • High pH (above 7.6) can cause scale formation on pool surfaces and heating elements.
  • Available in 1.5kg, 7kg & 25kg containers. 

The pH scale ranges from 0 to 14 and measures the acidity or alkalinity of the water. A pH of less than 7 means the water is acidic, a reading above 7 means the water is alkaline and a pH of 7 is neutral. Ideally the pH for swimming pools is between 7.2 and 7.6. Having the water slightly alkaline means that the pool is more comfortable for swimmers and the equipment is protected from the corrosive water. The effects of a high pH level (too alkaline) means the water can become cloudy, swimmers skin can become dry, chlorine becomes less effective and scale can form.

  • pH Minus
  • For decreasing the pH level in swimming pool and spa water
  • High pH (Alkali) will cause scale formation, poor chlorine efficiency, cloudy water and itchy skin.
  • pH Minus (Dry Acid) contains Sodium Hydrogen Sulphate
  • The ideal pool pH levels are between 7.2 -7.6, promoting bather comfort, optimum chemical efficiency and protection of pool plant equipment.
  • Routinely test the pH of your pool water and if it is above 7.6 use Blue Horizons pH Minus to reduce it.
  • Application Instructions: Pre-dissolve the product in a clean plastic container, with no other chemical present, at a maximum rate of 100g per 10 litres (2.2 gallons) of clean warm water. Stir well to ensure the product is fully dissolved. Carefully add the resulting solution to the pool whilst the pump(s) are turned 'on', preferably near to the water inlets to aid distribution.
  • After a minimum of 8 hours, recheck the pH level and if necessary repeat the treatment until the pH is established.
  • Please read the packaging and full instructions prior to use.


  • Guide Thumb

    How to treat green water

    Find out all you need to know about algae and green water, how to treat it and how to cure it.

  • Guide Thumb

    How to care for your pool during winter

    At the end of the outdoor swimming season, some simple procedures can ensure that your pool equipment is protected and the water condition is in good condition for the following year.

Returns Policy

Your rights to return goods are protected under the EU Distance Selling Directive.

You are entitled to cancel your order and return the goods within 7 working days for a full refund not including the cost of delivery. Do this by contacting us by email or telephone and quoting the order number supplied to you. Your refund will be paid within 30 days. You are responsible for the cost and risk of loss or damage when returning the goods, so you should take out enough postal insurance to cover their value. This cancellation policy does not affect your rights when we are at fault - for example, if goods are faulty or incorrectly-described.

Exclusions: Bespoke items (made to measure items) are not included and cannot be returned. If a bespoke item is faulty then the product warranty /guarantee will take effect.

Any goods returned should be in saleable condition.

These terms apply to your order. We may change our terms and conditions at any time, so please do not assume that the same terms will apply in the future.

None of these terms affect your legal rights and these are not diminished in any way. If any term is held to be invalid under any applicable statute or rule of law, that term is automatically omitted from the terms to minimum extent necessary to comply with the law and without affecting the validity or enforceability of the remainder.

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