What do you do if you have clusters of black dots on the surface and bottom of your swimming pool?
That is probably black algae. You need to go to a pool store and have them advise the proper chemical and use of that chemical for your pool. It may take a granular product for white plaster pools. Color tinted pools are another matter and you should use a liquid black algae treatment. And if you have a vinyl liner pool I just do not see how in the world you could get black algae. Black algae comes from not maintaining proper chlorine levels and adjusting the pH.
The reason why penguins are black and white , when its cold they turn there backs towards the sun to generate heat in there bodies and when they are to hot they will face the sun with there white fronts and reflect the suns rays Also because when penguins are swimming if they are swimming more towards to the top it is harder for preditors to see them because of the light from above, the…
How do you remove dark stains from the bottom of a swimming pool that are getting bigger day by day?
As opposed to what? Blue? I assume that you mean a black surface. A black surface will generally absorb more light than will a lighter colored surface. That's why you see it as black. In sunshine, it will heat up more than will a lighter colored surface because it is not reflecting as much light. Will it hold it? Beats me. What's it made of? All I know is that it's black.