I think it would be fine. However, filter sand has rough edges which is how it is different from regular sand pumped straight from the river. Filter sand is fractured or crushed to create the sharp edges that makes it filter well. Sand pumped straight from the river like Masonry , Gunite or Concrete sand is round from tumbling in the river current. That being said I am sure filter sand starts to become round at some point in its life span from being tumbled in the sand filter. I think it would take a long time, but pretty sure it happens like that.