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Most likely the pool water has a high concentration of copper. Introduction of chlorine would cause an immediate oxidation of any copper particulate in the water and turn it green. Some goes for iron but it turns the water brown.

Ph likely has little to nothing to do with it.

AnswerI can only imagine it has something to do with pH. Liquid chlorine has a high pH and it may be raising your already high pH to a point where dissolved metals (eg: iron) come out of solution into suspension. Something is wrong. Tell me what is pH of water, chlorine level before and after adding iquid chlorine? Answermetals

You need to add a sequestering agent. These are chemicals that combine with the metals in the pool, bringing them to the surface and not allowing the metals to fall to the bottom. This prevents staining during the treatment. Run your pool filter while adding the sequestering agent and leave it running.

Water colour dis-figurations are a common problem and headache for pool owners. Sometimes, we see that there's black in pool water, but have a difficult time tracking down information on what causes it and how we can clear it up. This is because it's not as common of a problem as say, green or cloudy water. However, that doesn't mean it's not as bad. We'd all like crystal clear water, so when it's colour looks a little off we have to worry about staining and so on.

These colour changes generally appear when the pool is initially filled or after a shock treatment. This is because if the pool contains metals all ready a shock treatment will oxidize them which makes them easier to see.

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15y ago

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