Pools goes cloudy or green
Causes: Often caused by a high pH or under-sanitation, which results in Algae Growth

Remedy: Correct the pH to read between 7.2 – 7, 6 with Pool Acid or Alkalinity 
Increase being careful not to overdose, shock dose with 3 – 5 cups of chlorine.

Pool turns Brownish Colour when chlorine is added
Causes: Low pH and when Chlorine is added it reacts with the water causing the iron in the water, which is normally present but cannot be seen, to come out of solution and become visible.  This can also cause bad brown stains on walls and floor.

Remedy: Lower Chlorine level (withdraw chlorine treatment until the Chlorine Level measures below 0,5ppm) this removes the iron from the water by precipitation. 
Correct the pH, and then vacuum to remove the resultant brown dust from the pool floor.

Algae growing on the walls and floor of the pool
Causes: Hot days with high humidity or thunderstorms, also under-sanitation and insufficient brushing.
 
Remedy: Brush vigorously. Thereafter, add a bottle of Pool Command Algaecide into the Pool. Shock dose in the late afternoon with 4 times the normal recommended dose of Chlorine and brush again.

Mustard/green colour algae suddenly appears on the pool walls
Causes: Usually insufficient sanitation.

Remedy: Correct pH.Brush the algae off the walls. Add one bottle of Pool Command Algaecide following instructions on the bottle.  Then shock dose with Chlorine in the late afternoon and brush once more.

Black Algae spots appear mostly in the shady side of the deep end
Causes: Under-sanitation and general neglect of pH testing and brushing.

Remedy: Brush vigorously with a stiff  Stainless Steel Brush if on marblite surface or with a very hard polypro Algae Brush if on a painted surface. Add a bottle of Pool Command Algaecide carefully following instructions.
Shock dose with chlorine for next 2 days in the late afternoon approximately 3 cups at a time.  Ensure correct pH prior to any chemical treatment.