Grey ReefaquaBRIGHT: Grey reefEnvironmental factors such as the shape and depth of your pool, shade created by the surrounding landscape and buildings, overcast days or natural or artificial life can. cause subtle changes in the water’s appearance See our other aquaBRIGHT colors:Kona CoastBlue MistBlue LagoonMediterranean BlueMidnight BlueSahara SandBlue GraniteGrey ReefFrench GreyPerle Noir