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Diagnosing Water Discolouration

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