We are RWa to provide you, from our Nicaragua Mine with White & dry Pumice stone, in all sizes, either from Industrial use, (zero grade) , medium size (stone wash) or Water filter size, Or Garden size. you name the size, we can do it, Our price per bag is $7 USd, 15 kilo,. Bag of white & dry pumice stone, Our product Holds Humidity up to 98% & has a good endurance capacity according to the university studies,.