Had acquired with skepticism the shell. Tried and what can I say, it works !! Finally no aerator and the constant buzzing of the pump and then the following screening. A light source to the center of the dish set (there goes up also close to a window and the hatched Artemia can be concentrated in the middle either be aspirated or removed by the strainer. Hangin, have even ordered two bowls, daamit always be Artemia available. We recommend !!!