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Undergravel Filters (UGF) Information
Here is information all about standard undergravel and reverse flow UGF setups, which are not ideal for use in reef tank systems because they can become nitrate factories. They are however suitable filters for fish-only saltwater aquariums, as long as this type of filtration setup is properly maintained.
The Undergravel Filter Controversy
From your About Guides, Stan and Debbie discuss the pro's and con's of using and undergravel filter for saltwater aquarium filtration.
The Undergravel Filterplate
From your About Host-Guide to Saltwater Aquariums, Don Carner discusses UGF's, how a they work, cost perspectives, and the pros and cons for using this type of filtration.
Undergravel Filter Plan
From your About Guides, Stan and Debbie Hauter give instructions and graphics for building your own UGF.
The Undergravel Filtration Controversy
Aquatics Unlimited writes this article about their opinion that UGF's should never be used.
Removing an Undergravel Filter
This article from Aquatics Unlimited, written by Jim Kostich, gives advice on how to go about removing a UGF.
Undergravel Filters Profile
From Winston Schoenfeld's Suite101 Aquariums site, Winston gives you an understanding of how the air lift system makes your UGF work, including a detailed diagram.
Undergravel Filtration Revisited
Aquatics Limited provides a Q & A format in this article, responding to questions asked about UGF's after their Undergravel Filter Controversy article appeared.