Bicarbonate, the active ingredient in the baking soda, is an effective spot treatment to help to kill the algae and loosen it from the wall. But with enough scrubbing, you can banish the black algae for good.Click to see full answer. Thereof, what does baking soda do to a pool?Baking soda, also known as sodium bicarbonate is naturally alkaline, with a pH of 8. When you add baking soda to your pool water, you will raise both the pH and the alkalinity, improving stability and clarity. Many commercial pool products for raising alkalinity utilize baking soda as their main active ingredient.Furthermore, will baking soda clean pool water? While a baking soda scrub is a great way to clean pool tiles, grout, and furniture, baking soda doesn’t really “clean” a pool. Instead, baking soda helps to maintain the pH levels of the water, which keeps a pool healthy and inviting. Beside this, how much muriatic acid does it take to kill algae in pool? If the pH reads high, use one gallon of muriatic acid, which should be enough. Don’t worry about adding too much acid. Test the pH again after shocking and 4 hours of circulation.What naturally kills algae? Add barley straw to the pond to slowly kill the algae. As it rots, barley straw will slowly release small amounts of hydrogen peroxide that will kill any algae growing in your pond. Buy a small bale of barley straw and throw it into your pond when you first notice algae growing in your pond.