Two Little Fishies Foam Disks for 550 Model Reactor, Set of 2

Black reticulated foam sponges used to replace the original parts from the PhosBan Reactor model 550. These sponges may also be used for dividing the column in a reactor to segregate different types of chemical filter media, such as activated carbon, PhosBan, or adsorption resins. Packaged as a set of two.