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What do you do if you have clusters of black dots on the surface and bottom of your swimming pool?
I have the same problem, my pool shop suggested getting the acid level to normal (around pH 6-6.5) ensuring stabiliser levels were normal and adding granulated chlorine, I added the choline and it went cloudy (don't add liquid chlorine at this stage) leave it for a week then go back to normal chlorine dosing, the combination of these steps should remove the black spot, mine went to a lighter shade of green but is still there, I may have to repeat the first 2 steps as my pool was out of balance.
Did you try anything else that may have worked?
Ian
What else can I help you with?
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Why look for black precipitate in the butt instead of on the surface of an H2S test?
The black precipitate usually sink to the bottom which the reaction took place in. The reaction takes place at the bottom because it only occurs under anaerobic conditions, and it does not sink to the bottom as it only occurs at the bottom, not around oxygen at the top of the tube.
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Common examples of consonant clusters in English words include "bl" in "black," "str" in "street," and "spl" in "splash." These clusters are groups of two or more consonants that appear together in a word.
Why look for black precipitate FeS in the bottom instead of on the surface during a test with H2S in aqueous solution?
To detect hydrogen sulfide production, a heavy metal salt containing ferrous iron is added to a nutrient culture medium, when hydrogen sulfide is produced the sulfide reacts with the metal salt producing the black precipitate.
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Cobalting is what the black spots on fiberglass pools is called. This occurs when the gel finish on the pool begins to break down. You can remove the old gel coating and apply a new one.
