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.
The most obvious effect of algae is the visual degradation of the appearance of your aquarium. The goal is to create an appealing environment with a high degree of clarity. Algae growth on glass, rocks, driftwood, plants, equipment etc. challenges the achievement of that goal. Less obvious, but more severe effects of algae is its negative impact on plants and fish life.