Will have to have a think about which sand to use.
Much easier when they're out sorting it out for themselves.
Not sure if it's the sort of thing your looking for but I use coconut fibre for both in the coop and to aerate the rather clay soil in the middle of my hens run.
Just bought some from Amazon £7.99 for a compressed 5kg block which floofs up to 70lt, I haven't used this particular brand before, normally I have to leave it out for a few days as it's slightly damp straight out of the bag, but from reviews this one seems to be dyhydrated so I'm hoping it can go straight in the coop.
I've used hemp bedding for years but I much prefer the coconut fibre, so much easier for daily poo picking and I can put it straight on the garden when it's needing changed.