[Forum Moderator]

Hello!

I think the main problem with the color of the water comes from the saturation of the "Transmittance" color. The more saturated it gets, the easier is to get closer to that color as the light attenuates. By default, the water preset from the Transparent assistant assigns a pure white color to the Transmittance, and this will make it darker and darker, but not bluer.
Adding some saturation to it and choosing the right hue will make your pool look more natural.

[Andreas Hopf]

I've had closer look at the pool image above.

I looked at a white fibreglass pool, 160 cm deep, with fresh clean water filling, no additives. The water was "light turquoise" at best, not the cliché "rich blue" colour. See the white glass tiled pool or the off-white "Cemcrete" pools below. I guess that without simulating minerals and particles in the water, one would need the cliché blue pool tiling. But that's just my guess.