Overview Specifications Industries & Applications Documentation & Tools ;


Product Features
  • Suitable for wastewater plants, biologically active filters and more
  • More driving head results in longer filter run times
  • Provides even backwash distribution to deep clean filter media
  • Reduces construction costs replacing up to 14 inches (36 cm) of gravel media support allowing for the same media depth in less vertical space
  • Physically rigid design reduces flexing and withstands pressures up to 15 psi (1 bar)
  • Precision-engineered 1 mm slots support media down to 1700 microns (1.7mm)

Designed to improve efficiency and reliability

Providing a more effective option than using gravel in most applications, the I.M.S® 1000 media retainer is engineered to allow for improved backwashing and improved air and water distribution for cleaner media. Thanks to its physically rigid construction and precision engineered injection molded slots, the I.M.S 1000 media retainer eliminates dead spaces and provides longer filter runs reducing overall operating costs. 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. 1000 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 1000 media retainer
Potable Water, Wastewater, Desalination Pretreatment
Particular applications
Intended for wastewater, denitrification and 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 1000 media retainer
System components material
High impact plastic
Media suitability
Media over 1.7 mm effective size: Can be placed directly on the cap; Media less than 1.7 mm effective size: Requires graded gravel
Uses 316 SS screws
Slot size
1 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/ wastewater treatment chemicals including chlorine and ozone
Industries & Applications

Industries & Applications

Recommended Industries and Applications

Reuse > Tertiary Treatment Filtration
Media Filtration
Potable / Drinking Water > Filtration Media Filtration
Documentation & Tools

Documentation & Tools



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