One thing you could do is add a narrow plane along the top and make that a particle emitter. As particles you can use meta balls with a water shader. You’ll need to play with the settings to find the look you’re going for. In addition you can work with dynamic paint on the pool water to have it interact with the particles.
I did that a little while ago for a fountain and it looked more realistic than I expected – plus is less taxing on your hardware.
