Hi guys!
Here is my attempt at pool water. I fake IOR in a brutal way, but it kinda works
Enjoy

very nice

same using 2 custommaterial, 1 to make refraction on pool texture and 1 to make water turbulences.
code from : http://glsl.heroku.com/e#10585.0

The shader is not complete because I didn't add light and specular, so to fake them I use others material superposed with transparence. but it can give an idea of use of custommaterial

and another just for fun with a strange liquid over the surface :p

Very cool! The only thing that looks unnatural is the strange UV projection on the inner sides of the pool.
I think this can be cured by making the sides separate meshes.

this can be resolved by selecting this faces and transforming uv with transformEx

Ahhh. It replaces Texture transform matrix for such cases. Thanks.