There is a device called a mole chaser, it is a plastic rod that you shove in the ground, it accepts 4 d cells and emits a sound every few seconds that moles don't really like, one stake is supposed to cover 1/2 acre, when i put a couple into my hillside next to my creek, my dog had a hayday catching moles for about a week while they were confused and trying to relocate their habitat.
They moved back last winter since the batteries died and i thought I wouldn't need them over the winter, unfortunately, it was mild and i should have kept them running, so in the spring after i reloaded them with fresh batteries, my dog had a hayday again.
They seem to work pretty well, maybe stick on right beside the pool.