Get him to put out water feeders / birdbaths. Maybe with a bit of chlorine in it, supposedly like catnip, offer him a tablet. Needs to be closer than you are. This is best.
Warn him your pool has boric acid in it and its probably deadly to bees. Bioguard optimizer / proteam supreme are expensive versions of this. It also lowers surface tension so bugs cant land. They will find other sources. (A very useful pool chemical in a lot of ways, ph, algaecide, silky/sparkly )
All quats: benzyl ammonium chloride , polyquats: poly-xxx-ethylene dichloride, algacides even the cheap stuff (quats) reduces surface tension.
https://www.poolgeek.com/products/ultima-skimmersupport-clarifier. This is a purpose made surface tension reducer.
** Skill-it https://www.amazon.com/dp/B00AM3SHJ6/ is used for the same reason youll see half the reviews are for wasps, bees, bugs. Less needed - some apparently just spray the waterline. (May not be best prices for either) edit- added note on skill-it