Elfrieda, I have never considered using cat litter as an amendment to the "sand". I moved here 10 years ago and my 5 acres was entirely sand with pines and turkey oaks. They grow very well in the sand.
I garden in only a fraction of the property. I mulch with pine needles, oaks leaves and whatever organic matter I can get my hands on without spending a lot of money. I have loaded my van with bags of raked leaves from peoples yard I passed on the road and everything I plant from the nurseries, the pot full of soil goes in the ground. I mulch the gardens with the chipped tree trimmings when the power company trims around the power lines. (They dropped 3 truck loads the last time they trimmed)
My sand goes down to the aquifer 120 feet down. It's a tough battle. But after tens years, I am seeing some difference in the top 10 inches of ground. It also helps to grow plants that are native to your sand. It's a trial and error in finding the plants that best like your soil.
I guess after all this, cat litter is not the solution to the sand issue. If you walk in it, it will just stick to your shoes and you'll track it in the house.
