Fluval U2 Foam Pad captures large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process. It is custom-made to fit perfectly inside the filter chamber to prevent debris bypass.The foam pad has a pore size that allows efficient water flow, less clogging and long-lasting filtration. Suitable for freshwater, marine or reptile environments.Key Features :For Fluval U2 Underwater FilterCaptures large particles and debris for effective mechanical filtrationCustom-made to fit perfectly inside the filter chamber to prevent debris bypassHas a pore size that allows efficient water flow, less clogging and long-lasting filtrationSuitable for freshwater, marine or reptile environmentsIncludes 2 foam pads