Sponge Filters
Slate base 15ppi Sponge filter
Internal-weight sponge filter
Internal-weight 30ppi sponge filter
30ppi Mag Sponge Filter
30ppi Slate Bottom Sponge Filter
50ppi Slate Bottom Sponge Filter
15ppi Mag Cube Filter
PPI Comparison

Filter - Cube Sponge Filter

Regular price $4.50
Shipping calculated at checkout.

Made from our Pro-Level Reticulated Foam, specifically suited for colonizing nitrifying bacteria at the highest levels.

The current lift-tube color is a dark green.  The Slate bottom filters have a round slate attached to the bottom. 

As you can see from the list below, a 4.25" cube contains a lot more foam than a 4" one - over 20% more!

  • 3" cube filter has a volume of 27 cubic inches
  • 3.25" cube filter has a volume of 34 cubic inches
  • 4" cube filter has a volume of 64 cubic inches
  • 4.25" cube filter has a volume of 77 cubic inches
  • 5" cube filter has a volume of 125 cubic inches

Sponge Filter Details:  Please read here