Fluval 1 "Plus" Foam Insert (2-Pack) is specially developed as a standard filter medium for the Fluval 1 Plus Underwater Filter and maximizes surface contact between the water and the media. The large filtering surface ensures efficient cleaning of the aquarium water and maximizes the colonization of beneficial bacteria.
Foam insert provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack.
