The seldom seen green flash occurs just before the last part of the sun disappears from view at the end of the 15 second clip. According to NASA, the almost-mythic spectacle is caused by the atmospheric bending and scattering of sunlight.
There are some products for the fountains which remove the suds easily. They are found in the market and they are dissolved in the substances that cause the problem. The organic material left on the tap of the fountain mostly causes the suds. You can use the towel to soak the suds from the place. To remove the soap suds you can use the wet vacuum cleaner gently. You can use silicon which is a great anti foaming agents. Try to add little bit of salts that also prevents the growth of the suds. You can also use vinegar. Just a capful of vinegar is enough for a wall fountain to remove the suds.
How to use sodium bisulphate / Dry acid in pools & spas. Sodium bisulfate is used to lower the pH and to maintain total alkalinity TA in swimming pools and spas. It is safer and easier to use than hydrochloric acid (muriatic). It is easier to store but it also must be handled with care.ry acid may be used in a spa or hot tub. Using Sodium Bisulphate as silver / metal pickle. The purpose of the sodium bisulfate solution is to remove 'borax glass' or fire scale left on metal during the heating process.