They are cute but you might want to shoo them away now - they can make a real mess of your pool. (I grew up on a lake, so ask me how I know.) And if you feed them - they will invite their friends. Also, the chlorine is not good for them. Don't forget it i getting towards that time of year when they are looking to make a nest. Again very cute - but very messy.
I don't want to sound mean but I had many a days scrubbing the dock with a heavy broom. Good luck!