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IMI Series

Hydraulic Suction Scanning Screen Filter

The High Performance Standard in Scanning Filtration

Rain Bird’s IMI-Series Hydraulic Suction Scanning Screen Filter provides worry free high-flow rate filtered water quality. Powered by source line water pressure, the filter’s backwashing system produces a concentrated high velocity reverse water flow to systematically clean the mesh screen of any entrapped contaminants. Models are available as a filter unit only, or as a filter assembly including bypass plumbing and valves for fast and easy installation on site.


The unit consists of two stages of filtration, a coarse screen pre-filter and a stainless steel fine screen. Suspended solids accumulate on the inner surface of the fine screen, building up a filter layer which eventually restricts the filter and creates a pressure differential. Once the pressure differential reaches a preset level a rinse cycle is initiated by the Rain Bird supplied controller. The solids are removed from the fine screen using a concentrated backwashing method which aggressively sucks the accumulated dirt off the screen where it is carried to drain via the rinse valve. The dirt collector rotates while it moves linearly, ensuring the entire screen is cleaned each cycle. The process takes a matter of seconds, without interruption of system flow.

Monitoring and Controls

The standard Rain Bird automatic control system consists of a microprocessor based controller, a differential pressure switch and a solenoid actuated flush valve. The differential pressure switch monitors inlet and outlet pressures and comes factory preset to 7 psi. The flush valve is activated by the controller when the differential pressure exceeds 7 psi. The filtration system is automatically monitored and controlled on elapsed time since the last cleaning cycle or pressure differential (user definable). If timed cleaning cycles are utilized, the system will automatically default to a backwash based on differential pressure if a 7 psi differential pressure is reached before the next timed cleaning cycle. Standard Rain Bird automatic controls are available for 115 VAC and 230 VAC, 50 / 60 Hz (user-configurable) single phase power. Omni 2000 Controllers are used for single and dual filter applications. An Omni 150-I battery operated controller with DC Latching solenoid and optional Solar package is also available for single filters.


Rain Bird IMI-Series filters are built for years of durable, trouble-free service. The housing and covers of standard filters are made from thick wall high-grade, low-carbon steel. All exposed surfaces, both inside and out, polyester powder coated over a zinc phosphate primer coat. All wetted components are constructed of either engineered plastics or non-corrosive metals. Standard micron wire mesh screens are PVC-supported which virtually eliminates the possibility of screen collapse. Easy maintenance access to the internal components of the filter is via a removable front cover with handles that are secured to the front end of the filter housing. All wetted components are constructed of either engineered plastics or non-corrosive metals. Larger screens are manufactured in a modular form which allows replacement of sections of the wire mesh, rather that the entire wire mesh element. All Rain Bird IMI-Series filters are also available in Stainless Steel construction, for the most demanding water quality applications.


  • Available as filter only (no bypass plumbing) or as a complete assembly
    with bypass plumbing and valves for easy installation
  • Heavy-duty, durable, SS woven wire mesh screen filtration element with PVC support is supplied standard. Other screen construction including multi-layer sintered SS and wedgewire are also optionally available upon request.
  • Standard flow rates from 400 to 5,000 gpm
  • Standard maximum operating pressure of 150 PSI (higher pressures optionally available)
  • Filtered, clean water backwashing initiated automatically by time or pressure differential via integrated Rain Bird controller
  • Flanged inlet and outlet standard. Grooved inlet and outlet configuration optionally available

Technical Data

Flange Size
Max Flow Rate
Open Screen Area (in2)
Woven Sintered
IMI-02-PE-I 2 NPT 110 64 96
IMI-03-PS-I 3 175 64 96
IMI-03-PE-I 3 175 237 356
IMI-04-PS-I 4 350 120 180
IMI-04-PE-I 4 350 474 713
IMI-06-PE-I 6 660 474 713
IMI-08-PS-I 8 1320 474 713
IMI-08-PE-I 8 1320 713 1070
IMI-10-PS-I 10 1760 632 950
IMI-10-PE-I 10 1760 945 1420
IMI-12-PS-I 12 2640 945 1420
IMI-14-PS-I 14 3960 1070 1605
IMI-16-PS-I 16 4840 1070 1605
IMI-18-PS-I 18 6125 1070 1605
IMI-20-PS-I 20 8100 2140 3210
IMI-24-PS-I 24 12000 3210 4815