Individuals with normal color vision will see a number, while those with a deficiency do not see it. On some plates, a person with normal color vision may see one number, while a person with a deficiency sees a different number.
Your phosphate level should be at or below 100 parts per billion (ppb). If your water chemistry and phosphate levels seem to be in check, one potential cause of the cloudiness in your pool could be dead algae. Phosphates are the food supply for algae, thus high phosphate levels promote algae growth.
This is the macro algae (Chaetomorpha Algae, also called Spaghetti Algae) growth in my refugium. You can almost watch it grow in real time. Well, almost. The algae growth is benefitial for the display tank since it takes out nitrates and phosphates and therefore reduces the algae growth in the display tank.