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How to identify your pool stain
As soon as a stain appears get your water professionally tested asking the pool dealer to test for metals! This will help identify the problem but remember, the longer the stain has been present, the harder it will be to remove. The secret is to identify the cause and deal with the stain as soon as it appears. Greenish-Brown Stains - These are most likely organic stains caused by leaves or other plant matter. Blueish-Greenish-Black Stains - Likely caused by copper which can be present in source water or corrosion of copper piping somewhere in your plumbing system. Greenish-Brownish-Red Stains - Usually caused by iron from your source water or possibly from metal fixtures in and around the pool area, such as a fence, that have begun to rust, and this rust gets washed into the pool when it rains. Brownish-Blackish-Purple Stains - This is caused by manganese from your source water. Both borehole/well water and municipal water contain manganese. Black Spots in fibreglass pools - These should not be mistaken as black spot algae as these are Cobalt Oxide stains. To determine this, you can conduct a “fingernail test” where you scratch the stain with your nail. If there’s any residue under the nail, then it is highly likely that this will be algae and needs to be treated differently. If there is no residue, then you have osmosis.
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