Storm water filter and components thereof and methods of installation and use

Abstract

A storm water drain filter including a collapsible frame supporting a filter bag. The filter may be installed in a stormwater drain pit to capture contaminants and particulate matter before it enters a stormwater drain. The collapsible frame is light weight, compact, simple and inexpensive. The filter bag is secured to the frame so as to maintain its shape and avoid deformation. There is also disclosed a method of installing a stormwater drain filter in a stormwater drain pit to provide an effective seal between the stormwater drain filter and the pit.

1 - 20 . (canceled) 
     
     
         21 . A storm water drain system including:
 a. a pit;   b. a storm water drain filter including:
 i. a rigid frame; and 
 ii. a filter bag having connectors positioned about its periphery for attachment to the frame, when assembled, so as to maintain the shape of the bag in use; and 
   c. a cantilever mounting arrangement to mount the storm water drain filter to a wall of the pit.   
     
     
         22 . A storm water drain system as claimed in claim  1  wherein the cantilever mounting arrangement includes a rail mounted to the pit wall and cantilever arms mounted to the rail. 
     
     
         23 . A storm water drain system as claimed in claim  2  wherein the cantilever arms may be secured at a desired position along the rail to accommodate the rigid frame. 
     
     
         24 . A storm water drain system as claimed in claim  1  wherein the bag is formed of a permeable material. 
     
     
         25 . A storm water drain system as claimed in claim  4  wherein the bag is formed of a mesh material. 
     
     
         26 . A storm water drain system as claimed in claim  5  wherein the bag is formed of a metal mesh. 
     
     
         27 . A storm water drain system as claimed in claim  5  wherein the bag is formed of a synthetic mesh. 
     
     
         28 . A storm water drain system as claimed in claim  5  wherein the bag is formed of fire retardant mesh or glass fibre mesh. 
     
     
         29 . A storm water drain system as claimed in claim  1  wherein the bag is at least partially formed of an impermeable material. 
     
     
         30 . A storm water drain system as claimed in claim  9  wherein the lower side walls of the bag are impermeable and the base of the bag is permeable. 
     
     
         31 . A storm water drain system as claimed in claim  8  wherein the base of the bag is filled with filtration media. 
     
     
         32 . A storm water drain system as claimed in claim  11  wherein the filtration media is selected from: sand, Zeolite, rain garden mix, activated carbon, absorbents and adsorbents. 
     
     
         33 . A storm water drain system as claimed in claim  1  wherein the frame includes top plate. 
     
     
         34 . A storm water drain system as claimed in claim  13  including a seal between the top plate and the pit. 
     
     
         35 . A storm water drain system as claimed in claim  14  wherein the seal is formed of a compressible sealing material. 
     
     
         36 . A storm water drain system as claimed in claim  14  wherein the compressible sealing material is compressible foam or rubber. 
     
     
         37 . A storm water drain system as claimed in claim  16  wherein the compressible sealing material is a rubber seal or mastic and foam tape 
     
     
         38 . A storm water drain system as claimed in claim  13  wherein the bag is dimensioned to provide an overflow path at the top of the bag in use. 
     
     
         39 . A storm water drain system as claimed in claim  18  wherein the overflow path is provided between the top of the bag and the top plate. 
     
     
         40 . A storm water drain system as claimed in claim  18  wherein the top plate includes an inlet channel extending below the bag overflow provision. 
     
     
         41 . A storm water drain system as claimed in claim  20  wherein the inlet channel is removable. 
     
     
         42 . A storm water drain system including:
 a. a pit;   b. a grate at the top of the pit; and   c. a storm water drain filter including
 i. a rigid frame suspended from the grate; and 
   
       a filter bag having connectors positioned about its periphery for attachment to the frame, when assembled, so as to maintain the shape of the bag in use.