lol blue, i think they will be back at your swimming pool!............
bees like junky water and swimming pools.....why?
bees like the junkiest water they can find, gutters, mud holes, rivers, rain mud puddles, the dirt in the garden, etc...... or swimming pools. swimming pools have chemicals added to them.....a 'scent'........junky water has 'scent' of some sort for them. the bees visit a source of water, go back to the hive and tell their sisters where it is and maybe give a sample of it. foragers can communicate where it is but their sisters can't really find it without the passing of a 'scent sample'?.......
oh this is the stuff? or the largest body of water with chlorine in it..........
call me nuts, but i think i would throw some mud/dirt in there, or better yet a little lemongrass oil.............i have done this and found the bees will go to water with some lemongrass oil in it, but got to keep it sorta on the junky side. if they have a choice between clean water and your swimming pool, you may find some at your new watering hole, but my bet is still on your swimming pool
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good luck with your experiment and looking forward to updates!