Filtering system for runoff water

A filtering system comprising:

• an inlet for receiving fluid to be filtered,
• a reservoir fed by said inlet,
• an outlet for receiving fluid that overflows said reservoir,
• a filter cell fed by said reservoir,
• said filter cell having:
• (a) at least first and second layers of filtering material, said first and second layers having a common porous sidewall,
• (b) the first of which layers receives fluid from said reservoir and allows said fluid to pass through said porous sidewall to the second layer,
• (c) a drain, said second layer and said drain having a common porous sidewall,
• said porous sidewalls comprising a material for preventing passage of filtering material therethrough while allowing passage of fluid therethrough,
• in which there are at least two of said cells and in which one of said cells completely surrounds another cell in at least one plane.

A filtering system comprising:

• an inlet for receiving fluid to be filtered,
• a reservoir fed by said inlet,
• an outlet for receiving fluid that overflows said reservoir, and
• a filter cell fed by said reservoir,
• said filter cell having:
• (a) at least first and second layers of filtering material said first and second layers having a common porous sidewall,
• (b) the first of which layers receives fluid from said reservoir and allows said fluid to mass through said porous sidewall to the second layer,
• (c) a drain, said second layer and said drain having a common porous sidewall,
• said porous sidewalls comprising a material for preventing passage of filtering material therethrough while allowing passage of fluid therethrough,
• in which said drain surrounds said layers in at least one plane.

A filtering system comprising:

• an inlet for receiving fluid to be filtered,
• a reservoir fed by said inlet,
• an outlet for receiving fluid that overflows said reservoir, and
• a filter cell fed by said reservoir,
• said filter cell having:
• (a) at least first and second layers of filtering material, said first and second layers having a common porous sidewall,
• (b) the first of which layers receives fluid from said reservoir and allows said fluid to pass through said porous sidewall to the second layer,
• (c) a drain, said second layer and said drain having a common porous sidewall,
• said porous sidewalls comprising a material for preventing passage of filtering material therethrough while allowing passage of fluid therethrough,
• in which said layers and drain are cylindrical and concentric and said drain surrounds said layers in at least one plane.

A filtering system, comprising:

• a first filtering media,
• a second filtering media that is different than said first media,
• a first porous barrier that allows fluid, but not filtering media, to flow through it, separating said first and second filtering media,
• a second porous barrier separating said drain from said second filtering media, said second porous barrier allowing fluid to flow through it from said second filtering media to said drain but not allowing filtering media to pass through it, and
• an inlet for feeding fluid to be filtered to said first filtering media,
• wherein said first filtering media has two sides,
• said second filtering media being located adjacent both of said two sides,
• said first porous barrier extending between said first and second media along both of said two sides.

A filtering system, comprising:

• a first filtering media,
• a second filtering media that is different than said first a first porous barrier that allows fluid, but not filtering media, to flow through it, separating said first and second filtering media,
• a drain,
• a second porous barrier separating said drain from said second filtering media, said second porous barrier allowing fluid to flow through it from said second filtering media to said drain but not allowing filtering media to pass through it, and
• an inlet for feeding fluid to be filtered to said first filtering media, and
• a reservoir having a tray feeding fluid to be filtered to said first filtering media, said tray having an overflow outlet,
• in which said first filtering media has two sides and said first porous barrier and said second filtering media extend along both of said sides, so that fluid in said first filtering media may pass out both of its sides to said second filtering media.

A filtering system comprising:

• a first filtering media having two sides, first and second porous barriers each of which has a first face and a second face,
• said first face of said first barrier covering one of said sides and the first face of the second barrier covering said other said side,
• a second filtering media having a first face covering the second face of said first barrier, said second filtering media having a second face,
• a third porous barrier that receives fluid from and covers said second face of said second filtering media,
• a first drain that receives fluid that has passed through said third porous barrier,
• a third filtering media having one face covering the second face of said second porous barrier, said third filtering media having a second face,
• a fourth porous barrier that receives fluid from and covers said second face of said third filtering media, and
• a second drain that receives fluid that passes through said fourth porous barrier.

A filter for filtering a fluid comprising:

• first and second filter cells each of which is a filter for said fluid and one of which cells surrounds the other in at least one plane,
• each said filter cell having two sides, one of which sides is an input side and one of which is an output side,
• each said filter cell having a drain which extends from said output side toward said input side and receives the filtered fluid and discharges the filtered fluid, said drain having two ends one of which is open to the flow of said fluid and is at said output side and the other of which ends is closed to the flow of said fluid,
• each said filter cell having filtering material for filtering said fluid,
• each said filter cell having a fluid flow path for receiving fluid to be filtered at said input side and passing said fluid through said filtering material to said drain, and
• means for distributing the fluid to be filtered to said cells with only a part of the total fluid being fed to each cell.

A device for filtering a fluid, comprising:

• a filter having two sides one of which is an input side for receiving the fluid to be filtered and the other of which sides is an output side for discharging the filtered fluid,
• said sides having a space between them,
• said device including a first filtering portion that extends at least most of the way from one of said sides to the other of said sides in said space,
• said device also having a second filtering portion surrounding said first portion in said space,
• means for feeding the fluid to be filtered to said portions so that each said portion receives and filters only a separate part of the fluid to be filtered and including filtering material that filters fluid passing through such portion,
• each said portion having a drain which receives the filtered fluid and delivers it to said output side,
• each said drain having an end at said output side which end is open to allow the fluid to be discharged from said drain, each drain terminating in a second end which is closed to fluid flow.

A filter for filtering a fluid, comprising:

• a first layer extending around a central location in at least one plane, said first layer having a first end open to receive the fluid to be filtered and a second end located at a lower elevation than said first end and closed to the passage of fluid through said second end,
• a second layer extending, in at least said plane, around said first layer and composed of filtering material,
• a first drain extending, in at least said plane, around said second layer for discharging filtered fluid from said filter,
• a third layer extending, in said plane, around said drain, said third layer having a first end for receiving fluid to be filtered and having a second end closed to the passage of said fluid,
• a fourth layer comprising filtering material extending, in said plane, around said third layer, and
• a second drain, extending, in said plane, around said fourth layer, for discharging any fluid it receives, and
• means for feeding only a part of the fluid to be filtered to each of said first and third layers.

A filter for filtering a fluid, comprising:

• a first layer extending around a central location in at least one plane, said first layer having a first end open to receive the fluid to be filtered and a second end located at a lower elevation than said first end and closed to the passage of fluid through said second end,
• a second layer extending, in at least said plane, around said first layer and composed of filtering material,
• a third layer extending, in said plane, around said second layer, said third layer extending, in said plane, around said second layer, said third layer having a first end for receiving fluid to be filtered and having a second end closed to the passage of said fluid, and
• a fourth layer comprising filtering material extending, in said plane, around said third layer.