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Filtration

How to build your own filtration devices from scratch.
Do-It-Yourself Undergravel Filter
Although this article was written by the Saltwater Aquarium Guides, it works just as well for a freshwater aquarium.
An Air-driven Reverse-flow Undergravel Filter
Bob Dixon wrote this detailed article about building your own UGF.
Filter Media
Lots of great ideas for inexpensive substitutes for filter media.
Sponge Filter
A simple sponge filter makes all the difference if you are raising fry. This newsgroup discussions covers how to make and keep them clean.
Wet-Dry filtration
Over a dozen newsgroups messages about building your own wet-dry filter. Good reading.

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