Do I need a Biofalls if I can just dig a basin at the top and fill it with lava rock? Wouldn't that do the same thing?

Creating a filter as described will not have proper waterflow distribution, will be prone to clogging with sediment and debris, as well as be very difficult to clean.  The Aquascape Biofalls® Filter is a very effective biological filter as a result of how the water flows through it and the type of filtration media it uses.  It is also very easy to clean.

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