So I have a water filtration pump to filter the contaminated water and turn it into water, but I have built it and it's not receiving any of the sand it needs. I tried to disable the building and re-enable it and still no one delivers it. I also tried deconstructing it and rebuilding it and I have the same problem
Build the water purifier and wait to see if anyone delivers the sand material. Try to disable the building and then re-enable it. Also try to destroy it and rebuild it.