How to Clean an Undergravel Filter

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How to Clean an Undergravel Filter. Part of the series: Fish Tanks Aquariums. Undergravel filters in aquariums use gravel as filters in order to pull water and debris into the gravel before transferring water back into the tank. Learn about why it's important to keep undergravel filters clean and functional with help from the owner of a pet fish store in this free video on undegravel filters. Read more: http://www.ehow.com/video_5226151_cle...

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