Supa Undergravel Filter for BF18/BF21

23" x 11" Bow Front Filter

Under-Gravel Aquarium Filters are suitable for Tropical, Marine or Coldwater Aquaria. They are to install, offer proof against "digging-up" by fish, have a high filtration rate, eliminates the filter wool layer and also the air lift tube can be easily cleaned & positioned at either end of the filter.