Method, device and apparatus for monitoring halogen levels in a body of water

A device for monitoring a concentration of a specific halogen in a bathing unit, said device comprising:

• a. a housing configured for floating on top of a body of water held in a receptacle of the bathing unit, said housing having a lower portion configured for being at least partially submerged in water during use and an upper portion configured for extending at least partially above the water, said lower portion including walls extending into the water and defining spaced apart opposing windows made at least in part of a material permeable to ultraviolet light;
• b. an optical absorption analyzer positioned within said housing, said optical absorption analyzer being configured for making measurements of transmission of ultraviolet light from a light source through a sample of the water held in a receptacle, the sample being between the spaced apart opposing windows, said light source emitting light at a specific wavelength, wherein the specific wavelength of the light source corresponds to the specific halogen whose concentration is being monitored, said optical absorption analyzer comprising a processing unit configured for:
• i. deriving the concentration of the specific halogen at least in part by processing results of the measurements of transmission of ultraviolet light from a light source through the sample of water;
• and
• ii. releasing a signal conveying the derived concentration of the specific halogen.