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Those bees may be attracted to the hot tub by smell - probably of the 'chlorine' or whatever your water treatment is.
You can try giving them a different 'scented' water source. I'd try one that is between the hot tub and the hives. Make sure it has an odor, and also has some kind of floats so bees don't drown.
Bees have different standards for desirable water than humans do. Smelly water (compost water, chlorinated water, cattle urine, etc) may be attractive because bees can communicate the location to other bees better if the water has a distinct odor.
You can try giving them a different 'scented' water source. I'd try one that is between the hot tub and the hives. Make sure it has an odor, and also has some kind of floats so bees don't drown.
Bees have different standards for desirable water than humans do. Smelly water (compost water, chlorinated water, cattle urine, etc) may be attractive because bees can communicate the location to other bees better if the water has a distinct odor.