This must be an algaecide of some sort possible a low grade of chlorine. Did you follow the instructions EXACTLY? Is this product supposed to settle on algae spots? If not , did you brush it to keep it from clumping and settling on the bottom of the pool? The black stains, possible caused by the product burning the plaster where it settled --- improper use of product. Impossible to know without seeing the stains and finding out just how you used the product.
Contact Bioguard for further info.
For marcite or plaster finish - Acid Wash. Google "acid wash" . Also Pumice stone will srub off black or green algae.
My experience is that the stains will go away by themselves, through the effects of the chlorination of the water. Does not matter if the pool is a salt pool or fresh water pool. If the pool has a plaster finish, brushing the stains with a wire pool brush will speed up the process.
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It should easily remove red win stains. As with all stains you will want to remove it as soon as possible.
Baking soda is the best way to remove acid stains from concrete. Dawn may remove grease stains from concrete. Vinegar is another great solvent for grease stains.
to remove brown stains from your teeth you will have to brush them or floss them...
bleach stains cannot be removed.
Green stains (copper color) that cannot be removed indicate you might have a pH problem. K
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Shout removes stains from jam, grass stains, coffee stains, ink stains, blood stains, motor oil stains, etc.
No