pH Minus

When the water is more alkaline, pH Minus is used to decrease the pH

pH Minus is also known as Sodium Bisulphate, Dry Acid

There are two basic reasons for chemical treatment of your spa water:

  1. The pH, total alkalinity and calcium hardness of the water must be balanced so that the water is neither corrosive or for scale to form.
  2. The water must be sanitised to make sure that it is free from harmful infections, organisms (such as bacteria and viruses), free from unpleasant algae and free from organic bather wastes(body oils, lotions, cosmetics etc.

The pH of your Spa is to measure how acidic or alkaline the water is. The pH is measured on a scale of 0 - 14, a pH of 7.0 is neutral.

When you test the spa and there is a pH reading of below 7.4 this means the water is more acidic than alkaline, this can cause various problems such as:

-Sanitisers to dissolve more rapidly
- increase corrosion of surfaces and equipment
- may cause eye and skin irritation

If the reading is higher than 7.6 it means that the water is more alkaline which can cause different problems such as:

- sanitisers such as chlorine to be less effective
- will produce scaling on the surface of the equipment
- cloudy water
- shorter filter runs

The Spa water should always be tested 30 minutes after treatment. 

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pH Plus

When the water is more acidic, pH plus is used to increase the pH