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You and Your Under-Gravel Aquarium Filter

You and Your Under-Gravel Aquarium Filter

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...

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