I use construction sand . course type. that is for concrete. I have a designated area where there is this sand. Sand is not all I have. Most of area is just earth. On top of earth soil I spread out grass clippings during summer which dries and turns into hay. This concrete sand around here they call it torpedo. Don't know why such name ??? Have used it for many years and have had NO PROBLEMS.. Washed sand is construction grade sand that I HAVE USED IN MASONRY BRICKLAYING, It is washed to provide better consistency in masonry mix texture. This masonry sand is finer than the course concrete grade. I have not used this for my chickens because always had enough of the course available. There was no difference in price when I purchased it at the supply yard. I did buy it by the cubic yard for construction purposes. If your chickens are eating SO much sand. ( and I am not directing this at you candylandranch, just those that said that their chickens had BAD results from sand.) then try giving them more food. I don't see my chickens eating the sand at all. They scratch thru it and dust in it.
Now as to birdman55 suggesting washed masonry sand. Many here on this thread suggest using sand more course. I agree with the many. birdman55 also says that play box sand we buy for our children is manufactured sand and implied that it contains glass particles. I took that seriously and started researching it quite deeply. SO FAR I HAVE NOT FOUND ANYTHING TO SUBSTANTIATE THAT TO BE SO. I really do want to find the source of that claim. Please post that information source if you find it. I can see Personal Injury attorneys filing class action lawsuits against such sand manufacturers if it was DANGEROUS. (to our children of course, not chickens. ). There are many different types of sands worldwide. All depends on what type of rock was crushed and eroded over time to make it. It then ended up in concentrated amounts that we refer to as quarries. Under the microscope it may look like sharp little bandits . reason is because many of these sands are from crystalline sources such a quarts.