www.swimmingpoolnews.co.uk
WaterTesting AUG 2010 Spn
“The longer the pH is left untreated, the more swimmers will be exposed to dangerous illness”
The claim was that not enough was being
done to make regular checks on water quality levels and says a number of larger pools surveyed in a random check were in danger of “falling the wrong side of regulations”. Hanna Instruments provide invaluable
information on the hidden dangers of seemingly inviting water. The look and smell of the water in your pool
can tell you a lot about its quality but it is a common misconception to assume that if it looks clear and a chlorine test tells you free chlorine is present, the water is safe for swimming. Most people assume that free chlorine is the
most important parameter. What many do not realise is that if the pH level is too high, the chlorine simply will not work. Instead, bacteria will flourish and swimmers will be put at risk of serious infection. The optimum level for pH in a pool is around
7.2. If, however, the level rises significantly above this, free chlorine becomes inactive and will not work. The danger is that it will still show as being present in the water. For example, a free chlorine level of 3ppm would indicate that the pool is safe and protected for swimming. However if the pH has risen to around 9 or 10, the chlorine will be unable to function, bacteria will start to thrive and the water will become unsafe for swimming. The longer the pH is left untreated, the more swimmers will be exposed to dangerous illness. As the pH of your pool is the single most
important parameter, accurate testing is an absolute priority. Testing methods vary from test strips and phenol red tablets to digital photometers and pH meters. Of these a pH meter is the most accurate, fast and easy to use method. It uses no reagent but gives an instant digital readout across the full pH scale.
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Hanna Instruments provide vital information on hidden dangers of seemingly inviting water
Making precision testing quicker, easier and more
affordable, Hanna Instruments offers high accuracy digital testers for both pH and free chlorine. The Hanna Pocket meter is a great favourite.
Offering the same accuracy as a bench pH meter, it offers high precision testing in a portable pocket-sized format. Portable, waterproof and
with a rubberised keyboard, the dual level LCD display gives readings for both pH and temperature. What’s more, with one quick dip test, it does away with the need for test strips and guess work, giving you a fast, accurate result. This summer Hanna Instruments has also introduced a pocket photometer – the Chlorine
LEFT: Certikin’s PC 9 in 1 pool tester – ideal for operators of all sizes of pools
ABOVE: PT 100 Pooltester from POOL-id which measures pH and chlorine and/or bromine values
RIGHT: Despite it’s age, even in today’s high-tech environment, Lovibond’s ‘fixed colour’ glass Comparator offers accurate and reliable testing
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