Many other conditions sometimes cause weakness (see Table: Some Causes and Features of Muscle Weakness). For example, electrolyte abnormalities (such as a low level of magnesium or calcium) can cause weakness that sometimes comes and goes, as well as muscle cramping and twitches.
For swimming pool chlorination, see Swimming pool sanitation. Water chlorination is the process of adding chlorine (Cl. 2) or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic. In particular, chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery, typhoid etc.
Chloramines are also known as combined chlorine. Total chlorine is the sum of free chlorine and combined chlorine. The level of total chlorine will always be higher than, or equal to, the level of free chlorine. If the total chlorine level exceeds the free chlorine level a super chlorination or shock is needed. If the pool water has a strong, offensive odor and is irritating the skin or eyes of the swimmers that may be a sign that you need to âshockâ the pool to remove the total chlorine.