Importance

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Abstract

A filtration device is provided with a filter tank, filter medium unit, magnet, and submerged air discharging mechanism. The filter medium unit includes a large number of magnetic filter medium granules formed of metal balls. When the magnet is in a first position, the magnetic filter medium granules magnetically attract one another. When the magnet is moved to a second position, the magnetic filter medium granules are released from the mutual magnetic attraction. In cleaning the magnetic filter medium granules, a clean fluid located above the magnetic filter medium granules is poured between the magnetic filter medium granules. In cleaning the magnetic filter medium granules, the submerged air discharging mechanism ejects air into the clean fluid above the magnetic filter medium granules and toward the magnetic filter medium granules. Air bubbles are introduced into the clean fluid by the ejected air.

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First Claim