Patent ID: 7655151

Claim:
A method of operating a fluid treatment device employing a non-bonded media for treating the fluid, comprising the steps of: containing the non-bonded media in an annular chamber located between an inner perforated cylinder and an outer perforated cylinder of said fluid treatment device; passing an influent radially through the non-bonded media for treatment of the influent during a treatment operation; and passing a purge fluid down an upper portion of the inner perforated cylinder during a packing operation and then outwardly into the annular chamber to pack the non-bonded media in the annular chamber; and during the packing operation passing the purge fluid through the outer perforated cylinder in a direction to carry with it particulate matter accumulated on the outside of said outer perforated cylinder to a location outside of a housing that contains said inner perforated cylinder and said outer perforated cylinder.