Finest-Filters 6 pack replacement filter pre filter foams compatible with the Oase Biomaster external aquarium filters.

We stock all 3 grades of pre filters – 30ppi brown, 45ppi blue or 60ppi black. Please select the option required from the drop down menu when ordering.

The higher the ppi rating, the finer the filter foam, and will therefore remove finer waste particles, but will require more frequent cleaning.

Please Note: This is not an original Oase product, it is a Finest-Filters alternative intended to perform the same function.