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Chemistry Of Pool Water Essay

881 words - 4 pages

Introduction
The objective of pool inspection is to protect public health and safety by ensuring the pools are maintained and operated in compliance with the regulations. There are many different aspects of the swimming pool that need to be checked to ensure its safety, not only the water quality, but also the areas around the pool including equipments, recirculation system and etc. Routine pool inspections allow the operators and the inspectors to identify potential problems that require repair or adjustments to avoid accidents from occurring.
Water quality
Proper water chemistry is essential to maintain the safety of the pool operation. Water chemistry usually includes five big factors: pH, free available chlorine, combined available chlorine, total alkalinity, and calcium hardness. Too much or inadequate level of any water chemistry would cause cloudiness, irritation, corrosion, or even health hazard to the swimmers. Moreover, improper balance of the pool water can damage the filter and piping systems.
The pool water was very clear that the pool drain could be clearly seen when standing on the edge of the pool at the deep end. The water level of the pool was maintained right above the skimmers. Liquid sodium hypochloride was used as disinfectant. Water chemistry was tested by using Taylor test kit. The results were found as the following:
pH 7.5
Free available chlorine 2.5ppm
Total available chlorine 3.0ppm
Combined chlorine 0.5ppm
Hardness 210ppm
Total Alkalinity 60ppm
Temperature 84F

According to the swimming pool regulations section 75, chlorine residual should be maintained greater than 0.5ppm when the pH is between 7.4 to 7.8. The temperature of the water should not be higher than 98F. This swimming pool complies with the regulations.
Total alkalinity act as a buffer to resist changes in the pH. There is no regulation about total alkalinity, but it is recommended that it should be maintained between 80ppm to 120ppm. The total alkalinity measured at the inspected pool was only 60ppm which was lower than the recommended value. Such low alkalinity levels might cause pH bounce. Low level of total alkalinity may also cause corrosive, and eye irritation. Sodium bicarbonate can be added to the pool to increase total alkalinity. (Add stuff from the text about how often should alkalinity be measured.)
The concentration of combined chlorine was found to be 0.5ppm. It is recommended to superchlorinate the pool before the level of chlormaine reaches 0.5ppm. High levels of chloramines caused odour, skin and eye irritation, and cloudy water. Ten times more chlorine than combined chlorine is required to superchlorinate the pool; therefore it is more economical to shock the pool when...

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