Preserve your stormwater quality and your budget.

Easy to ship, install and maintain. Made in the USA with quality, recycled materials.

  • Meet TSS removal requirements.

    Meet TSS removal requirements.

    Install on new projects as an affordable equivalent to gravity separation devices, hydrodynamic separators, swirl separators, and vortex concentrators.

  • Reduce your storm sewer system maintenance costs.

    Reduce your storm sewer system maintenance costs.

    Greatly decrease the frequency of costly maintenance on your downstream BMPs. For example, over the long-term, pond dredging costs are 2x to 4x that of vacuuming sediment from manholes that discharge to the pond.

  • Meet permit requirements.

    Meet permit requirements.

    Quantify your annual sediment removal with performance data backed by full-scale, independent third party laboratory testing.

Learn How It Works

See It In Action

  • “We like to see the new competition and significant cost savings of The Preserver™ over existing products. It’s also good to know that these are ready to go when needed. We called in our order and it was delivered to our office the next morning.”
    - Estimator, St. Paul Utilities & Excavating, Inc.
  • “The design couldn’t be any simpler to install. I also liked that all the drill bits and bolt drivers were included, which can easily save us an hour of running to a store if we didn’t have them.”
    - Foreman, St. Paul Utilties & Excavating, Inc.

The Preserver™ Advantage

Alternatives to The Preserver™ Disadvantages of Alternatives The Preserver™ Advantage
Standard Sump Manholes Sediment captured in the sump is subject to scour during large storms. Sediment is washed downstream and the sump's intended function is diminished. Increases the removal efficiency of suspended sediment at low flows and virtually eliminates sediment scour at high flows.
Sump Manholes With Skimmers Skimmers trap floatable pollutants but increase sediment scour. The Preserver's energy dissipator works in tandem with skimmers to provide the same excellent scour suppression performance.
Swirl And Vortex Separators Swirling stormwater is proven to increase suspended sediment removal at low flows but exacerbate scour at high flows. Scour suppression has a greater positive effect on removal efficiencies on an annualized basis.
Devices With False Floors And Skirts These devices restrict access to the sump and are difficult to inspect and maintain. The Preserver's streamlined design leaves plenty of room for access and maintenance.
Baffles Require center mounting that restricts access and maintenance. Awkward to design and install when there are multiple inlets. Not designed or tested to work with skimmers Simple design and installation requires one dissipator per inlet. Low profile dissipator was designed and tested to work alone or in tandem with skimmers.
All Treatment Devices Typically not retrofittable and come with a high price tag. The Preserver™ is retrofittable and affordable.

Why Sediment Retention Matters

Several publicly funded studies have been performed in recent years to quantify the removal and retention performance of several common gravity separation manholes. 

When using that data in a continuous simulation that mimics natural rainfall patterns, the results show that suspended sediment removal devices designed to suppress scour perform much better on an average annual basis versus all other devices tested. 

Frequently Asked Questions

What materials is The Preserver™ made of?

The Preserver™ consists of two materials: 100% recycled HDPE and stainless steel. These materials are commonly used in stormwater applications for their high strength and resistance to corrosion

How do I install The Preserver™?

Installation of The Preserver™ is quick and easy. Installation consists of two basic steps: 1) Align and attach the mounting brackets to the manhole wall and 2) Attach the energy dissipator and skimmer components to the mounting brackets. We provide all the mounting hardware, drill bits and drivers required for installation. Detailed installation instructions are included with each Preserver™.

How do I retrofit The Preserver™ into existing sump manholes?

Simply remove the components from the box, lower into the manhole, then follow the included installation instructions.

How do I maintain The Preserver™?

The sump manholes into which The Preserver™ is installed should be cleaned of collected sediment one to two times per year using a vacuum truck. During this time, the overall condition of The Preserver’s components should be checked and any debris which may have collected on the energy dissipator or skimmer should be manually removed.

Do I have to worry about clogging?

No. Several studies have been performed to determine the typical composition of debris typically found in stormwater. The results are not surprising, with nearly all debris consisting of (listed in order from highest to lowest amounts): plastic bottles, papers, cigarette butts, cardboard, organics (wood and leaves), cans, fabrics, plastic bags, Styrofoam cups, and broken glass. The minimum hole size in The Preserver’s energy dissipator is specifically designed not to clog by passing debris typically found in stormwater.