Fluval U4 Underwater Filter Foam Pad
The Fluval Foam Pad was designed specifically for the U4 filter model to captures large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process. Custom fit to prevent bypass, they have a pore size that allows efficient water flow with less clogging for long-lasting filtration. The Fluval Foam Pad is for freshwater, marine or reptile environments.