Biological Sponge Filter Model #BDB9


The reticulated sponge measures 9" x 9" x 9" with a 20" tall

PVC chimney, {Can be shortened if needed.}

This large sponge filter functions as a biological filter

and clarifies water through "solids capture".

This design requires 0.25 CFM, includes 20 feet of 3/16" ID

air tubing and a high quality

Bubblemac air diffusers model #0020

Unit comes fully assembled and ready to go to work.

Just pour one pound of sand or gravel down the chimney