101 and is fixedly connected at its second end to extended rod 104 a second guided sleeve 108 is pivotally attached between the first and second ends of rigid strut 103 and has a fixed threaded nut 113 through which threaded fastener 105 can be tightened in operation street curb inlet filter 100 can be easily inserted into a street curb inlet in a collapsed mode and then the threaded fasteners 105 can be tightened with an appropriate tool or by hand pulling compression strut 103 upwards in a reverse scissor movement spreading the assembly until it is locked into place in the street curb inlet with rods 102 and 104 sealing off against the top 121 and bottom 120 of the street curb inlet the inlet filter 100 is placed into the street curb inlet behind the face 122 of the curb so that no part of the system protrudes past the face 122 of the street curb inlet when the torque force on threaded fastener 105 is set properly the street curb inlet filter 100 can withstand the force of incoming water and accompanying debris the street curb inlet filter of fig1 is shown with only two expander brackets 140 and 150 in practice street curb inlet filter 100 may be much longer and have multiple expander brackets it has been found that expander brackets approximately every 12 inches provides a good design choice for robust operation a number of design options exist for providing the driving force for expanding the brackets.