Defender® Regenerative Media Filters

The Defender® filter is an earth friendly solution for pristine pool water and it continues to have a marked impact on the global water footprint. This industry leading filter will give you maximum performance, longevity and user friendliness — an outcome that is good for the planet and our resources.

Here are the fabulous five benefits enjoyed by existing Defender® customers:

1) Water & Waste Savings

The Defender® filter virtually eliminates the tremendous amount of the backwash water associated with sand filter operation. Instead of reverse flushing, as with a sand filter, Defender® simply discharges the spent media directly to waste and is recharged from time to time.

2) Energy & Chemicals Savings

The dramatic reduction of backwash waste directly translates to savings in make-up water along with the chemicals and fuel for re-heating. Consider the cost of chemically treating 2.2 million gallons (8328 m3) and the BTUs required to heat this volume from 50 degrees (10°C) to 80 degrees Fahrenheit (27°C).

3) Construction Savings

More savings are derived from the smaller construction footprint for Defender® filter. This results in as little as one-fourth to one-sixth of the space required by an equivalently sized sand system, saving installation and rigging time.

4) Power Savings

Defender® reduces head loss (vs. compared to sand) to which saves motor horsepower operational cost. Starting differential pressures for a high-rate sand filter, depending on the media, could range from 4 to 6 psi (27.6 kpa to 41.4 kpa). In contrast, the starting differential of the Defender® is approximately 1 psi (6.9 kpa). Converting this to head represents savings of nearly 12 feet (3.65m) total dynamic head, or TDH, which translates to horsepower and energy savings. In most cases, the pump motor required for Defender® filter recirculation is smaller than a sand filter. Utilizing a 25hp motor instead of a 30hp unit would result in electricity savings of $3,000 per year.

5) Water Quality

The Defender® filter will remove particles down to 1 micron. With the growing concerns about waterborne illnesses (WBI) such as cryptosporidiosis, the smaller the particle removal the better. The Defender® filter is especially effective on pools with heavy bather loads because of the increased filter area and dirt holding capacity.

Lever Bump Specifications & Technical Data PDF |
Automatic Specifications & Technical Data PDF |

For a complete overview of the Defender® filter,
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Defender Assero™ Regenerative Media Filters

Modeled after our groundbreaking Defender filter, the new Defender Assero is perfect for smaller pool applications such as:

  • Splashpads & Spraygrounds
  • Swim Schools & Campgrounds
  • Spas & Wellness Centers
  • Hotels & Resorts
  • Apartments and Condominiums
  • Fountains & Water Features

Here are just a few benefits offered by the new Defender Assero™ :

Small – The compact size of the Defender Assero makes it ideal for both new construction and renovation projects.

  • New Construction: Assero can save up to 75% of the square footage required for alternative filter options.
  • Renovations: At just 82" in height and 29” in diameter, Assero is designed to fit through a standard doorway.

Safe – Assero filters down as small as 1 micron removing up to 99.9% of Cryptosporidium bacteria in a single pass.

Simple – While the technology is sophisticated, its operation is not. Just a few pumps of the Assero’s lever operated bump mechanism is all it takes.

Sustainable – Water, Chemical and Energy savings that reduce your carbon footprint.

Smart – Built on the Defender’s proven regenerative media technology.

Specifications and Technical Data PDF

For a complete overview of the Defender Assero™ filter,
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High Rate Commercial Sand Filters

Neptune-Benson offers a full range of steel and fiberglass filters that can be custom engineered and fabricated to suit your specific needs.

Model SHFFG (Horizontal Fiberglass High Rate Sand Filters)


Engineered to the highest standards for strength and to maximize long term performance and operational integrity.

Designed with superior materials including all vinyl ester resin, schedule 80 PVC internal parts and solid fiberglass flange connections.

Features include 14"x18" access manways, 15 year warranty, unlimited sizes and configurations and automatic backwash programming.

Features & Benefits

  • Vinyl ester resin maximizes strength and corrosion resistance against all chemicals including ozone.
  • Oversized 14"x18" manway provides safest access.
  • Integral base designed for seismic zone 4 installations.
  • Saddle base design allows for stacking in filter rooms to optimize use of available space.
  • Horizontal configuration also available in carbon steel or stainless steel construction.

Specifications & Technical Data PDF | Images

Model SRF (Vertical Steel High Rate Sand Filters)


Conservatively constructed heavy duty steel filters featuring a 28" deep sand bed, Flexsol 3000 lining, including a 10 year warranty

Features include a 14"x18' access manway, with sizes ranging from 36" to 120" diameter

Specifications & Technical Data PDF | Images

Model SDC (Dual Cell High Rate Sand Filters)


Dual-cell configuration constructed of high strength carbon steel featuring Flexsol 3000 lining. Available with a variety of face piping configurations.

Specifications & Technical Data PDF | Images

Model STC (Triple Cell High Rate Sand Filters)


Triple-cell configuration constructed of high strength carbon steel featuring Flexsol 3000 lining. Available with a variety of face piping configurations

Specifications & Technical Data PDF | Images

Custom Tank Configurations

For all your custom fabrication needs:



The best compact commercial filter on the market today. Legacy Filters are fiberglass molded with a UV inhibited Gel-coat finish

Features & Benefits

  • Easy access 14"x18" man-way lid (48" model only)
  • 6"x9" access man-way lid (42" model only)
  • Schedule 80 PVC internals
  • 3" bulkhead connections
  • 42" and 48" sizes available
  • Combination media dump port

Specifications & Technical Data PDF | Images


Face Piping & Automation Equipment

3-Way and Standard Face Piping


3-Way Face Piping is an easy way to operate your backwash valves. Available in lever, electric, gear and pneumatic operation

Specifications & Technical Data PDF | Images

Filter Controller

Model RMF — Defender® Filters Only

The automatic controller shall provide total control of the system’s filtration and regeneration cycles, and provide all necessary equipment interlocks and timing mechanisms to execute the filter program. The controller enclosure shall be a NEMA type 12 industrial enclosure.

Specifications & Technical Data PDF | Images

Automatic Filter Programmer

Model MFP2 & FP — Sand Filters Only

Controls the operation of your filter system with programmable backwash functions. This microprocessor based panel offers unlimited options including pressure differential and timed cycles for backwash scheduling. Available in 2 models, the MFP2 and the FP model.

Specifications & Technical Data PDF | Images

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