Only Diatom has this unique and fully patented new accessory concept. It completely eliminates the messy and time consuming chore of gravel washing. Easily attached to your present D1 Diatom Filter, you can wash gravel from the smallest spot to the entire aquarium bottom in minutes, without ever having to remove the fish or display pieces.

To be used with the D1 Diatom Filter and Model XL Diatom Filter.