Water Treatment & Filtration

Storm Water Management

Expanded Shale, Clay and Slate (ESCS) ceramic lightweight aggregate is providing new, consistent and cost effective options to address environmental concerns about the threat of storm water to our clean water supply. ESCS provides design flexibility for storm water management programs in meeting this environmental crisis.

ESCS offers low-maintenance solutions that meet existing and proposed government regulations without the use of chemicals, specialized equipment or major facility upgrades. On-site storm water management contributes toward LEED green building certification credit. The use of ESCS in such designs offers improved performance and longevity.

Lightweight Aggregate in Storm Water Treatment Units

ESCS adds a new dimension to the medium contained in storm water treatment units. As a replacement for sand, ESCS raises the bar for storm water treatment performance to new heights. The effectiveness of this new application is currently being tested by treatment unit manufacturers across the country.

As a filter medium, ESCS is very durable, and coupled with its porous structure and increased surface area, it is an exceptional filtering material for metalloids, suspended solids, oil and grease. ESCS has the long-term ability to absorb nutrients and maintain hydraulic flow to ensure that water treatment is effective and sustainable. ESCS is the clear choice for storm water management.

Uses of ESCS as Filter Medium

  • Filter Strips
  • Rain Basins
  • Rain Gardens
  • Geo-Sacks
  • Underground Filter Fill

Advantages of Using ESCS as Filter Medium

ESCS Physical Properties

  • Consistent, dependable (100% manufactured)
  • Physically and chemically inert
  • Greater surface area
  • Hydraulic conductivity allows fast, free drainage
  • Ceramic properties reduce material degradation
  • High angle of internal friction provides stability and strength
  • Reduced weight lowers freight and handling costs

ESCS Performance Properties

  • Predictable performance
  • Greater surface area
  • Removes or reduces phosphorus, arsenic, metals, grease, oils and more
  • Combines nutrient removal and effluent filtration for cleaner discharge
  • Employs ion exchange to enhance treatment process
  • Removes TSS and solid material to prevent clogging
  • Lower maintenance cost and extends service life
  • Economical, readily available and easy to use

A Ph.D. Student Tackles Stormwater Management

A Q&A with ESCSI scholarship recipient, Annesh Borthakur, is featured in the July 2022 issue of Rock Products.

Natural Aging of ESCS Amendment with Heavy Metals in Stormwater Increases its Antibacterial Properties: Implications on Biofilter Design

Article reprinted from Journal of Hazardous Materials, Volume 429, 5 May 2022, 128309, Annesh Borthakur, Kristida L. Chhour, Hannah L. Gayle, Samantha R. Prehn, Michael K. Stenstrom, Sanjay K. Mohanty, “Natural Aging of ESCS Amendment with Heavy Metals in Stormwater Increases its Antibacterial Properties: Implications on Biofilter Design,” pgs. 1-10, Copyright 2022, with permission from Elsevier.


Featured Project: Aquaponics Greenhouse