Is pumice used like cerium?

Yes and no.

Both are mixed into a slurry for grinding/polishing your glass surfaces.

Whereas cerium is mixed to make a loose slurry, pumice is mixed to make an almost mud like thicker slurry. Both can be used with a carrier like Synthetic or natural felt. We also have pumice specific carriers like brush wheels, Polpur's MJ wheels, and even flat lap disks of Polpur's MJ material for use on a flat lap. 

You can also see how pumice is used from our Learn page on pumice.