Pond Foam: What Causes Foam on Fish Ponds? These stubborn bubbles (white foam) are commonly due to an excess of dissolved organic compounds (DOCs) collecting in a slick along the water’s surface. The DOCs can come from many sources including overfeeding, a buildup of fish waste, or decaying plant material.Click to see full answer. Accordingly, how do you reduce foam in water?Another way to reduce the causes of foaming is to use a water bobble in the hot tub, such as these: The Zorbie, which is an orange sponge, or the Spa-Ball. So these two products float on the surface of the water, and they absorb the oils that are floating on the surface of the water.Likewise, why does foaming occur? Foam is created when the surface tension of water (attraction of surface molecules toward the center, which gives a drop of water its round shape) is reduced and air is mixed in, causing bubble formulation. As one passes across a curved surface or interface, a jump in pressure occurs. In this manner, why do I have foam in my koi pond? If you have fish, especially koi, you’ll likely experience foamy water which often caused by excess protein and nutrients. Foam is simply the result of air and water mixing together, and even though it may be an eye-sore, the foam itself is completely harmless to fish.How do you get rid of foam in beer?Pour a very small amount of olive oil onto the foam. Let the oil spread through the foam or spread it with a spoon. The oil will break down the foam by bursting the tiny bubbles. You can also get rid of beer foam by using the oil from your skin, as long as you don’t mind sticking your finger in your beer.