The pool water is supposed to be blue, but unfortunately, there may be times when this is not the case. And sometimes the colours it can turn will really confuse the owner and store personnel. Use the chart below to help determine what might be causing the discolouration.
| Colour of Water | Clarity of Water | Possible Problem |
| Green, Turquoise or Grey | Clear | Copper or Small-Celled Green Algae |
| Reddish-brown or Rust | Clear or cloudy | Iron |
| Dark Coffee Brown or Purple | Clear or cloudy | Manganese |
| Dark Green | Cloudy | Green Algae |
| Yellowish-Green | Cloudy | Mustard Algae |
| Yellowish-Green | Clear | High Total Bromine/Low pH |
