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If the serial number of your chlorinator is below 801100 then a green LED while making chlorine means the salt level is good, if blue while making chlorine then the salt level may be low, and if red while making chlorine then the salt level is low. You should always measure the salt level before adding salt and never let it go above 3000 PPM.
If the serial number of your chlorinator is above 801099 then a green LED while making chlorine means the salt level is high, if blue while making chlorine then the salt level is in range, and if red while making chlorine then the salt level is low. You should always measure the salt level before adding salt and never let it go above 3000 PPM.
If the water temperature is cold remove the ColorChlor from the water and keep in a safe place until you will use the spa again. Chlorine generators do not operate efficiently or at all at low temperatures.
As time goes on you notice that the ColorChlor or TechniChlor spa chlorine generators are not making as much chlorine as when new and you are having to increase the power levels. This may also be more noticeable if when you installed your spa chlorinator you started with fresh water. What is likely happening is there is a buildup of organic material that happens when you use your spa and that is using more and more chlorine.