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Aquarium having improved filtration system

  • US 7,249,571 B2
  • Filed: 10/07/2004
  • Issued: 07/31/2007
  • Est. Priority Date: 10/09/2003
  • Status: Expired due to Fees
First Claim
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1. An aquarium comprising:

  • a tank;

    a pump disposed in the tank; and

    an under gravel filter disposed in the tank below the pump, the under gravel filter including a bubble dispersing base plate and an overlying substrate, the plate being hollow and having a perforated top surface, the pump being connected to the plate such as to pump water into the interior of the plate to thereby cause bubbles to exit upwardly through the perforated top surface of the plate, and the substrate comprising particles having a size, shape and/or density such that particles are easily moved by the bubbles exiting from the perforated top surface of the plate.

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