It's unused!!
I have bought a couple of those gro-sac thingies, where you fill 'em with compost and stick your plants in. Just read the instructions, and it says I need gravel for drainage.
I'm 36 weeks pregnant, and can't be arsed to go to the garden centre and start hoicking bags of gravel around - have found an unused bag of cat litter in the shed, do you think this would work just as well??
TIA!