The scale upon which pools and similar sized bodies of water dwell doesn't really show the moon's gravitational influence to any relevant degree. I'm sure there may be a infinitesimally small change based on the positioning of the moon, but it's much to small to even bother with. On the larger scale, like oceans, it becomes noticeable simply because there's more water to pull on over a large, large area.

[quote]Moon's gravity pulls on the ocean and makes waves[/quote] Teh puma might be wrong on this, but last time he checked... tides and waves were still two different things. Usually to get waves you need some form of seismic activity, or the more common option, wind. To get wind, you'll need changes in air pressure. Since people typically don't have swimming pools half the size of Florida, you will not notice these air pressure changes.

Even some lakes are like that, the have small ripples but that's it.