Nice job. Only thing: at 1:09 you show the building reflection before you explain how. Great demonstration to get pool texture, sky, and surrounding all in the reflection.
Another touch is to add a swirl in PP. Simple with free Online Pixlr editor (Filter / Water Swirl)--for stills only, not animation.
Another PP note: I found that images (like your trees) come through transparent textures or faces much more sharply than the other objects, so you have to find a way to tone them down.
Thanks for posting this.
(Edit: looking at this post and image later--there's something confusing with the reflection line if you look at the rear of the pool. I think either the mirror plane is too low or you need to make the side of the pool below water translucent, or both.)
Screen shot 2012-08-08 at 9.png