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.
1 Red Algae: Red algae are mostly large, many celled algae. 2  The red algae's red pigment blocks off the color of chlorophyll. 3  One species of algae is eaten in Japan and another species of algae is used to make agar.4  Red algae can be 30-100 cm attached to rocks and shells. Red Algae: Red algae are mostly large, many celled algae. 2  The red algae's red pigment blocks off the color of chlorophyll. 3  One species of algae is eaten in Japan and another species of algae is used to make agar.