Everyone wants to enjoy a clean, clear pool. At time, perspiration, suntan oils, and other contaminants will eventually accumulate in your pool. These contaminants will reduce the effectiveness of the chlorine. Other signs of this contamination (referred to as "Combined Chlorine") are strong odors, eye burn, skin irritation and dull or cloudy water. This condition may arise after a week or two of normal use, or immediately after severe circumstances such as unusually large number of swimmers, heavy rains, or heat waves. To eliminate the contaminants and revitalize the chlorine, a process known as "Shock Treatment" (sometimes referred to as "Superchlorination") is required.

If swimmers get eye burn and the pool has a "chlorine" odor, have i added to much chlorine?
No, these are signs indicating a need for more chlorine (a shock treatment)... not less. Free chlorine is odorless!

pool chemical guide > algae prevention