Did you model the water as solid block (say a box) or just a surface above and tweak with material setting until it turns out like this? Very nice appearance of pool water you got here even water surface just completely flat (still), not wavy, not noise at all, still like this's harder to archieve I guess so...
i think the water looks more like glass..but it's totally forgiven..haha coz this is a very beautiful shot u made man! i just love the colors, compositions, proportions..etc..damnn..this one's great stuff! keep it up!
Wow! The lighting/reflections is very eye-catching. A minor nitpick would be the sky as someone has already mentioned, but other than that, it is a really beautiful render, with a very soothing & relaxing ambience.
Damn, that pool looks just awesome. I like the contrast of the blues against the gold of inside the house, the lighting of the pool itself, the way the room's reflection is just "visible" enough on the water for it to really be water.