Wondering about the pros and cons of switching from a white plaster surface to a grey plaster. Does anyone have experience with the darker surface color? Pool contractor says they don't guarentee the darker colors as they tend to fade/mottle over time. Does anyone have a dark pool? Photos? Does it still look good after a few years or are we wiser to stick with the white plaster? Our pool is a 22,000 gal white plaster inground. Thanks for the help.