People swimming in the pool are main source of contamination. For maintaining the water quality of swimming pool you should consider the pH level of water, Chlorine level, total alkalinity and calcium hardness.
Check the pH and Chlorine level daily because to make sure that water quality has not altered overnight.
If the swimming pool are not properly maintained the water in domestic swimming pool may contain range of microbiological organism including Bacteria, viruses and protozoa and these microbes are responsible for health problem such as gastroenteritis, ear, nose and throat infections.
The pH level indicates how acidic or alkaline the water is at any given time. pH level required for swimming pool is 7 to 7.6. If the pH of the swimming pool is higher than 8 it results skin rashes while pH is less than 7 can sting swimmers eyes. The alkalinity and pH are interconnected, raising the total alkalinity raising the pH. The calcium hardness level also maintained because increase the level of calcium it causes health problems as well as Scum and scale on the surfaces and equipment.
To overcome this problem you should confirm that whether the water of swimming is tested by water treatment laboratories.