Using hay for your gerbils’ bedding can be an excellent option - it mimics what they would have in a natural environment, and provides them with something to chew on when they fancy a bit of variety. Many owners report that it makes their gerbils’ enclosure smell great - the hay is quite fragrant, so it can make the cage smell a lot more pleasant.
Lots of owners report that hay is best used in conjunction with other bedding options
Hay is often best used when combined with another material, such as beddings made from wood pulp. Gerbils can use they hay when they’re burrowing into the other material to support their tunnels and nests.