I'm using coarse sand in my brooder, and scrape off the top layer once a week. I do have branches in there as roosts, and one of them started to smell a bit after 2.5 weeks, so I threw it back outside and grabbed another downed branch. Besides that, there is no smell. I have 3 chicks in a Rubbermaid storage tub. I suspect the sand helps, as within 10 minutes the poo seems to be shrivelled up into a tiny bit in the sand, compared to the poo on newspaper which seems to spread and stink.