approximately 23 grams
IT IS IMPOSSIBLE TO ANSWER THAT QUESTION IN THAT FORM. YOU NEED TO SUPPLY MORE INFORMATION, SUCH AS THE OTHER DIMENSIONS OF THE POOL; WIDTH, DEPTH, IS THE DEPTH CONSTANT OR DOES IT INCREASE, ETC.
You might try cotton balls dipped in white glue that is cut with water. It will pack into a smaller item you can shape like a wad of turf. (This does take a while to dry!) Stack them up and let them dry and then paint with brown and greens. And remember that many of them were built into the side of a bank or hill to provide good insulation and solid earth packed walls. Other possibilities: Strips of leather Brown paper towels rolled and glued with the white glue/water mix. A foam backed placemat I would use small strips or pieces of artificial grass or some sort of carpet. Its easy to visualize the soil and grass layers.
Water fountains that produce two streams of water allows the customer to drink more water with less air, therefore less burping. Also with two streams there is less spraying.