When we see green water, we humans tend to think of algae or mould - it's hard to change that way of thinking. A pale , sandy pebblecrete will look like a sandy lagoon, whereas a blue will be more eye-catching. We replaced the second liner of our pool with blue tiles . It's quite a large pool, so we went for a dark blue, I still love the colour nearly ten years later.

I think if your surroundings are white and black with hardwoord timber floor, go with charcoal colour. Blue colour reminds me of when we used to go to the Snooker rooms in the city they were all blue. Charcoal is different and very modern. [https://www.houzz.com.au/photos/game-room-contemporary-family-room-chicago-phvw-vp~3202405[(https://www.houzz.com.au/photos/game-room-contemporary-family-room-chicago-phvw-vp~3202405) - Imagine this room with white walls

I have! I love white, but I find that they show dirt a lot more than darker colours. Also, since the pool will be unheated, I would prefer to go darker for warmth.

Hi Helen - I see no-one has answered yet! Are you able to post a photo? That will give us more of an idea about what surface the background colour is for, what is around the pool, the texture of the surface etc. Then we can help!