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If there is staining on the liner or concrete in the pool that is dark and not removable by scrubbing, there may evidence of metals in the water. Water may also turn abnormal colours. Metals can take their place in pool water because of metal foreign objects entering the water such as pennies or other coins, copper piping/fittings, the use of Copper Sulphate to clear algae, source water, or when water balance problems causing corroding of your heater. It is best to take a pool water sample to a water lab as soon as the staining or discolouration occurs and tell the technician about the problem. Do not shock the pool!
Filters should be cleaned or backwashed before adding chemicals to treat metals. Allow chlorine/bromine levels to drop below 1ppm or the chemical may not work effectively. This may risk the water turning cloudy or growing algae, but this is something that can be treated after.
Metal stains can be identified as follows:
|Metal||Stain Colour||Water Colour|
|Iron||Orange-reddish stain||Yellow-brown stain|
|Copper||Blue-green to black stain||Blue-green or black stain|
To treat metal staining:
If the stain is not treated almost immediately, it is inevitable that some stains will become permanent. If it is determined by water analysis that there is no presence of metals in the water, this staining could be organic (caused by elements of nature), or could mean that the metal has come out of solution. Proceed with the same treatment in attempt to remove stains and brushing daily or after your weekly shock treatment. This stain may lift over time through daily brushing and regular shock treatments.