Fleck Systems
66-260 GPM

Nelsen Filtration Systems with Fleck Controls are designed for commercial and industrial appli­cations requiring treated water for turbidity removal, iron removal, or taste and odor control, at flow rates up to 80 gpm. With a wide variety of filter medias available, Nelsen can manufacture the water filtration system needed, in single or a variety of multiple tank systems. With our dedication, you can be assured that Nelsen Filtration Systems will provide you with the support you deserve.

Features & Benefits

  • Lead-Free Brass Valve Body

    Offers superior strength and long lasting durability

  • High Flow Distribution

    Plastomer bottom Diffuser or Hub & Lateral systems offer highly efficient distribution and collection of water and regenerants in water processing equipment.

  • Composite Pressure Vessels

    Fiberglass construction offers outstanding performance and durability in harsh chemical enviroments with capacities up to 463 gallons.

  • Filtration Medias

    A variety of filter medias for sediment reduction (ie. split stream filters for cooling towers), chlorine and chloramine reduction for RO or DI pre-treatment, iron and manganese removal, hydrogen sulfide and other odor reduction, community water supply turbidity reduction, and more are available

  • Backwash capacity accommodates tanks up to 48" diameter
  • Single or multi tank systems designed for light commercial applications
  • Fully adjustable 5-cycle control delivers controlled up-flow backwash and down-flow service
  • Versatile top or side mounting suitable for commercial or industrial applications
  • Time-tested hydraulically balanced piston, seal and spacer design to pilot service flow and regeneration
  • Turbidity (Sediment) Filtration Systems - Sand filters use a bed of fine mesh sand coupled with a layer of course gravel to effectively remove suspended solids and turbidity up to 20 microns.
  • Zeolite Filters - ChemSorb® and Turbidex™ Filter Medias achieve superior filtration and solids loading over conventional sand or multi-media systems. ChemSorb® granules surface, micro-projections, together with the high surface area makes this material an ideal, water filtration media. ChemSorb® features a higher filtration capacity and higher filtration rating (5 micron nominal) with a reduced backwash frequency, reducing costs and saving labor. Turbidex™ media offers filtration efficiency in the 3 - 5 micron range, Turbidex’s enhanced performance results in down stream cost savings for chemicals, filter cartridges, membrane cleaning, membrane life, etc.
  • Activated Carbon Systems are best for removal of chlorine, dissolved organic contaminants, tannins, color, phenols, and unpleasant tastes and odors. The activation process of carbon determines what adsorption and filtering characteristics the carbon will possess and what can be filtered out of the water. The availability of numerous types of carbons today make activated carbon filters a versatile solution for a wide variety of water problems.
  • Iron Filters - Manganese Greensand filters provide an excellent removal of iron and manganese. Manganese Greensand is a purple-black filter medium that is used for the removal of soluble iron, manganese and hydrogen sulfide from water supplies. As the water passes through a Greensand filter, any iron and manganese present is oxidized and trapped by the media. Backwashing and rinsing of the media removes the contaminates.
  • Multi-Media Depth Filtration Systems (Sediment) offer a greater amount of filtration of finer solids down to 10 microns. Multi-Media filters consist of multiple layers of media - from course to fine. The course media layers reside at the top of the tank and the finer at the bottom. The course layers trap the largest particles and the finer layers at the bottom of the tank trap the smallest particles effectively using the entire bed “depth” for filtration of the problem water.

Additional Resources

Optional Equipment
  • GalleryImage

    ASME Code Tanks, fiberglass or steel can be specified when required, and can be spec'd to meet your specific application requirements.

  • XT Controller

    XT - Advanced Electronic Controller - In Time Clock Delay mode, the XT will display the number of days until the next scheduled regeneration. Some meter delated types will display the volume remaining (SRV) minus the reserve. Once the volume remaining is zero, the display will start counting down the reserve volume and queue (RGQ) regeneration.

  • NXT Controller

    NXT Controller - Network controller uses on-board communication capabilities to link multiple valves (via off-the-shelf CAT3, CAT5, or better cables) for system types 4,5,6,7,9,and 14.

Filter Media Flow Rates


TANK SIZE16 x 6518 x 6521 x 6224 x 7230 x 7236 x 7242 x 72
Min/Max/BKWMin/Max/BKWMin/Max/BKWMin/Max/BKWMin/Max/BKWMin/Max/BKWMin/Max/BKW
Greensand Plus2.8 / 16.7 / 153.5 / 21 / 204.8 / 29 / 306.3 / 37.7 / 359.2 / 55 / 5514 / 84 / 8519 / 115 / 115
Birm3.7 / 5.4 / 124.7 / 7 / 156.2 / 8.9 / 2011 / 15.7 / 3517 / 24.6 / 5024.7 / 35.4 / 7033.7 / 48.1 / 105
Carbon5 / 10 / 107 / 14 / 159 / 18 / 2015 / 30 / 3025 / 50 / 5035 / 70 / 7048 / 96 / 95
Calcite/Corosex3.2 / 6.4 / 124.1 / 8.3 / 155.3 / 10.6 / 209.4 / 18.8 / 3514.7 / 29.5 / 5021.2 / 42.4 / 7028.9 / 57.7 / 105
Multi-Media9 / 19 / 1211 / 25 / 1514 / 32 / 2025 / 56 / 3539 / 88 / 5556 / 127 / 8577 / 173 / 115
Filter Ag5 / 10 / 107 / 14 / 159 / 18 / 2015 / 30 / 3025 / 50 / 5035 / 70 / 7048 / 96 / 95
Filter Sand9 / 19 / 1211 / 25 / 1514 / 32 / 2025 / 56 / 3539 / 88 / 5556 / 127 / 8577 / 173 / 115
Chemsorb13 / 21 / 1317 / 28 / 2022 / 33 / 2538 / 62 / 4060 / 75 / 5080 / 125 / 85115 / 173 / 115
MTM5 / 10 / 107 / 14 / 159 / 18 / 2015 / 30 / 3025 / 50 / 5035 / 70 / 7048 / 96 / 95
KDF7 / 14 / 309 / 18 / 3512 / 24 / 5015 / 45 / 9025 / 75 / 15035 / 105 / 210X / X / X
Pyrolox5 / 9.5 / 307 / 12.5 / 408.5 / 15.5 / 5015 / 25 / 8525 / 40 / 14035 / 57 / 200X / X / X

Media flow rates are in Gallons per Minute. All tank sizes are in inches. When sizing units, use minimum capacity. Additional specifications available in Brochure Download above.

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