You and Your Under-Gravel Aquarium Filter

By: Paul Barry-Cox

What is an Under-Gravel Aquarium Filter?

An under-gravel filter is pretty much what the name implies, a filter beneath your aquarium gravel or substrate. It is made up of a perforated or slotted sheet of plastic, slightly raised above the base glass to allow water flow downward, through the gravel and up again through “uplift tubes”.  

Continue reading “You and Your Under-Gravel Aquarium Filter”