Useful Information



  • Salt Systems are becoming a more popular and healthier alternative in the treatment of swimming pool water here in Spain.
  • Over 90% of all swimming pools in Australia benefit from the use of a salt system.
  • In simple terms a Salt System works by the process of electrolysis.
  • Salt (sodium chloride) is added to the swimming pool water at a level of 4 – 6 grams per litre (over 6 times lower than the concentration of sea water).
  • The systems cell converts the salt into chlorine in its purest form, that eradicates bacteria from the water, free from chloramines which are a bi-product of conventional chlorine.
  • It is the chloramines in conventional chlorine that can contribute to burning eyes, make bathers skin itchy, hair brittle and create a strong chlorine odour. Asthma and eczema sufferers also experience many positive benefits from swimming in salt-water pools.


  • Automatic PH regulators maintain the PH of the swimming pool at the correct level by automatically injecting acid into the return on the pools filtration system.
  • PH is a logarithmic scale that is measured from 0.0 to 14 with 7 being neutral.
  • PH less than 7 is acidic and a reading over 7 is alkaline.
  • An ideal PH for a swimming pool is between 7.2 and 7.6. Water here in Spain tends to have a high PH reading of over 8, which when you consider that if a swimming pools PH is over 8.2 chlorine is 5 times less effective.
  • A high PH will also make the water appear cloudy and scale can build up on the swimming pool shell and in the pipes.
  • In a salt pool, scale can build up on the cell which can cause damage to the system therefore it is important that the PH level is kept within the correct range.

For more information and prices on our Salt Systems and Automatic PH Regulators please telephone or email for details:

Swimming Pool Chemistry (pool chemisty info supplied by IGH Pool Management)

In order to achieve crystal clear water that is inviting to use, healthy and free from any infections, the pool must be chemically balanced and correctly sanitized.
Pool water testing is an essential and critical part of all swimming pool operation. To maintain clean and fresh pool conditions, chemicals are consistently added, and chemical levels should be continually monitored.

In order to achieve immaculate results you will carry out the following tests on a regular basis.

Ph.: ph. is a measure of the waters acidity or alkalinity; it has a scale of 1 – 14, with 7 being classed as neutral. Below 7 is acidic, and above 7 is alkali. For swimming pools the ideal ph. range is 7.2 – 7.4.

It should be noted that this is also close to the natural ph. of the human eye and skin, so in keeping within this ph. range maximum bather comfort is achieved.

Chlorine: chlorine is the most common form of swimming pool sanitation, and must be tested for in 2 forms, free chlorine and combined chlorine. The free chlorine is the amount of chlorine which is available to kill bacteria, and destroy pollution. Combined chlorine is chlorine that has reacted with ammonia from human sweat etc., and has formed chloramines. The acceptable range for free chlorine can differ depending upon the type used, but for stabilized products, such as Tricolour, which is common in Spain, a range of 1.0 – 5.0 ppm should be the target.

As combined chlorine is spent, and has no function as a sanitizer, its level should be kept as low as possible, and “shocking ” should be carried out at any level over 1.0 ppm.
If you notice a chlorine odour or smell from your pool, a common myth is that the chlorine level is too high, when in fact the odour is actually the chloramines, so the course of action would be to increase the free chlorine content to “burn off “the waste product.

We test for chlorine content by using the DPD method, this enables us to test free chlorine level and then total chlorine level. We can then subtract the free from the total to calculate the combined chlorine level. Any testing using cheap supermarket type test kits should be avoided , as these use the OTO method of testing which will only read the total level of chlorine , and cannot distinguish the free available chlorine from the unwanted combined .

Cyanuric Acid: is added to chlorine to act as a stabilizer to prevent the free chlorine from being dissipated by strong sunlight and UV rays. The level of cyanuric acid must be carefully monitored as if it is allowed to rise too high it will shield the chlorine making it less effective and efficient. Cyanuric acid does not get used up or burned off, so continued use of stabilized chlorine will cause the levels to rise over time. The acceptable range is 30 – 80ppm.

Total Alkalinity: total alkalinity is the sum of all the alkaline substances which are in the water, this acts as a buffer to stabilize the ph. from erratic changes or spiking. When using stabilized type chlorine a range of 80 – 120 ppm should be the target.

Calcium Hardness: calcium hardness is a measure of all the calcium salts dissolved within the pool. If the level is too low, the plaster or grouting can be damaged and too high a level, scale will form around the pool. The acceptable range is 100 – 400 ppm.

Total Dissolved Solids: TDS is the term given to all the substances which have accumulated in the pool water, from chemicals, pollution and other impurities. High TDS levels can lead to cloudy water, and will reduce the chlorine effectiveness. In outdoor pools the TDS will build up over time as the strong sunlight will give a high rate of evaporation, leaving excess dissolved solids behind. The maximum TDS level should not exceed 1000 ppm above the mains or fill water TDS level.

For more information please click here, or you can call us on: 0034 662 671 379