Comparative method of maintaining a safe level of chlorine in a body of water

1. A comparative method for maintaining a body of water for human immersion through addition of chlorine, where a sanitizing content of the body of water other than a presence of chlorine in the body of water is unknown comprising:

measuring a free chlorine content in the body of water in ppm;

measuring a total chlorine content in the body of water in ppm;

determining if the free chlorine content body of water is within a range of 5 ppm to 1 ppm; and

adding a batch of chlorine to the body of water based on an “industry recommendation” if the total chlorine content in the body of water is not 3 ppm greater than the free chlorine content in the body of water and the free chlorine content in the body of water is within the range of 5 ppm to 1 ppm.

2. The method of claim 1 wherein the “industry recommendation” is to shock the body of water if the total chlorine content in the body of water minus the free chlorine content in the body of water is not greater than 3 ppm.

3. The method of claim 1 including adding chlorine to the body of water based on the presence of a hydantoin in the body of water if the total chlorine content in the body of water is at least 3 ppm greater than the free chlorine in the body of water.

4. The method of claim 3 wherein a further batch of chlorine is added to the body of water where the further batch of chlorine is based on a hydantoin present in the body of water.

5. The method of claim 1 when the “industry recommendation” is based on a difference between the total chlorine content in the body of water in ppm and the free chlorine content in the body of water in ppm.

6. The method of claim 1 wherein the body of water for immersion is a hot tub body of water.

7. The method of claim 1 wherein the body of water for immersion is a swimming pool body of water.

8. A method of maintaining a safe level of chlorine in a body of water where the body of water is in a swimming pool and when a nonchlorine content of a sanitizer in the swimming pool is unknown comprising the steps of;

testing the water in the swimming pool to determine a level of free available chlorine (FAC) in the water in the swimming pool in ppm;

testing the water in the swimming pool to determine a level of total available chlorine (TAC) in the water in the swimming pool water in ppm;

determining if the free available chlorine (FAC) is within a range of 0.5 ppm to 1 ppm and the total available chlorine is at least 3 ppm greater than the free available chlorine; and

adding chlorine to the swimming pool water based on the presence of a hydantoin in the body of water if the free available chlorine (FAC) is within the range of 0.5 ppm to 1 ppm and the total available chlorine is at least 3 ppm greater than the free available chlorine.

9. A method for maintaining a body of water for human immersion, where a hydantoin content of the body of water is unknown comprising:

measuring free chlorine content in the body of water;

measuring total chlorine content in the body of water; determining if the free chlorine content body of water is within a range of 5 ppm to 1 ppm;

determining if the total chlorine content in the body of water is 3 ppm greater than the free chlorine content in the body of water and adding chlorine to the body of water based on the body of water containing a hydantoin;

adding chlorine to the body of water based on an industry recommendation if the free chlorine in the body of water is greater than 1 ppm.

10. The method of claim 9 for maintaining a body of water for human immersion, where a hydantoin content of the body of water is unknown comprising:

adding chlorine to the body of water based on an industry recommendation if the free chlorine content in the body of water is less than 0.5 ppm.

11. The method of claim 9 for maintaining a body of water for human immersion, where a hydantoin content of the body of water is unknown wherein adding chlorine to the body of water is sufficient to shock the body of water.