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Product Features
  • Suitable for drinking water plants and desalination plants
  • Provides even backwash distribution to deep clean filter media
  • More driving head results in longer filter runs
  • Reduces construction costs reducing vertical footprint by 11-14 inches (28-35 cm) by eliminating gravel support allowing for the same media depth in less vertical space
  • Physically rigid design reduces flexing and withstands pressures up to 15 psi
  • Precision-engineered 0.2 mm slots support media down to 450 microns

Designed to improve efficiency and reliability

As part of the complete Leopold FilterWorx® filter system, the I.M.S® 200 media retainer is compatible with all Leopold underdrains and is a more effective option than using gravel in most applications. Thanks to its physically rigid construction and precision-engineered, injection-molded slots, the 0.2 mm slots allow for uniform distribution of air and water, while preventing sand and media smaller than 400 microns (0.4 mm) from passing through or obstructing the underdrain slots.

I.M.S 200 media retainer is engineered to allow for more available media expansion for improved backwashing and air and water distribution, eliminating deadspaces, and providing longer filter runs for cleaner media. The patent pending baffles on the bottom of the plate are designed to ensure air doesn’t roll to the high end of the cap.

The I.M.S® media retainers replace up to 14 inches (36 cm) of gravel media support allowing for the same media depth in less vertical space and longer air/water backwash.

Flexibility, affordability, and performance

Beyond exceptional, worry-free performance, the I.M.S 200 media retainers deliver a host of other benefits including lower capital expenditures related to its ease of installation and potential for a smaller vertical footprint, reduced operational expenses due to longer filter runs using less water and energy, and the product’s performance over an extended period of time.

As part of the complete Leopold FilterWorx filter system, it is compatible with all Leopold underdrains. I.M.S. media retainers are factory installed on the Leopold underdrains saving time and labor during installation.



General Information
IMS 200 media retainer
Potable Water, Desalination Pretreatment
Particular applications
Can be used for biologically active filters
Flow rate
Up to 30 gpm/sf (75 m/hr)
Underdrain suitability
Type XA , Type S, and Type SL
Types of backwash suitable
Water only, sequential air followed by water, concurrent air/water and sustained air/water
Standards met
NSF 61
System Components
IMS 200 media retainer
System components material
High impact plastic
Media suitability
All media with an effective size greater than 0.45 mm
Uses 316 SS screws
Slot size
0.2 mm
Maximum pressure
15 psi (0.94 bar)
Vertical footprint reduction
Compared to gravel up to 14" (0.35 m)
Chemical resistance
Resistant to all water treatment chemicals including chlorine and ozone


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Documentation & Tools




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