You can put as many pellets as you want in the outside ring. The sprayer only holds 8 pellets.
The CF Pack, however, holds 128 pellets, and is filled in a Canning Machine, with the Pack as the can at the bottom and the pellets at the top. When the Pack is used, each pellet is only worth 1 spray.
CF Pellets are created by compressing Construction Foam. Each CF will yield 1 CF Pellet.