Eli has 2 tables- 1 water/sand and the other just sand. I've used the sand table for all kinds of things, I don't think I've ever had just sand in it, lol!! I've used cob litter (found in the rodent section of pet stores for bedding, makes a great sensory bin filler), Insta-Snow, Cloud Dough, and now dirt. We really don't have a place for him to just dig in the dirt. I have an extra bag of dirt, so I may just dump it out in the yard somewhere for him. But for now, he has a dirt table.
I also just noticed in the picture of the dirt table are the water shooters (at the top of the picture). I bought those at the Dollar Tree. Just add a 5 gallon bucket of water and let them go! Tons of fun with water play!
The other table is his water/sand table. This year, I found colored sand. He was so excited that it came in purple, his favorite color! In the water, I put Nixall to help keep it clean and for it to not get funky/slimy.