If you need something quick gravel for a fish tank has always worked for me, but like tellno1 said you have to have drainage. I used 2 5 gallon buckets, I used a 3/4 inch spade drill bit and bored 4 holes in the bottom of one bucket and then placed it inside the other bucket. The bottom bucket caught oall the excess adn made it easy to dispose of just pull the one out and dump the other then place them back.