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AWWA B100-25

Granular Filter Material
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AWWA B100 is a standard published by the American Water Works Association (AWWA) that defines requirements for granular filter media used in water treatment systems — especially for treating drinking water and other water supplies.

Purpose of AWWA B100

The main purpose of AWWA B100 is to standardize granular filter materials (like sand, gravel, anthracite, and similar media) so that they are suitable, safe, and reliable for use in water filtration systems:

  • It establishes criteria for what qualifies as acceptable filter media — including physical, chemical, and performance attributes.
  • It’s intended for purchasing and installing filter media, giving utilities and suppliers a consistent benchmark for quality.
  • It does not provide detailed filter design guidance itself, but supports design efforts by specifying the properties of the media that should be used.

In essence, the standard ensures that any granular filter material used in drinking water treatment can perform effectively and safely, without introducing contaminants or degrading prematurely.

 What AWWA B100 Covers

AWWA B100 applies to granular materials such as:

  • Silica sand
  • Gravel and high-density gravel
  • Anthracite coal
  • Other high-density media used in filters

The standard specifies things like:

  • Particle size distribution
  • Shape and roundness
  • Specific gravity
  • Chemical stability and purity
  • Absence of contaminants like silt, clay, or organic matter

This helps ensure consistent filtration performance, predictable backwashing behavior, and longevity in service.

How It’s Used in Practice

  1. Water System Procurement
    • Utilities reference the B100 standard in purchase specifications when buying filter media.
  2. Quality Control
    • Suppliers test media to meet the AWWA B100 criteria before delivery.
  3. Installation and Verification
    • Contractors and operators use B100 specs to verify that the media installed in filtration units meets expected standards.
  4. Regulatory Compliance
    • While AWWA standards are voluntary, they are often incorporated into project specifications, regulatory frameworks, and engineering contracts because they reflect industry consensus on reliable performance.

Why It Matters

Using media that complies with AWWA B100 helps ensure that filtration systems:

  • Efficiently remove turbidity and particulates
  • Operate reliably with lower maintenance
  • Do not introduce unwanted contaminants
  • Have predictable backwash and operational characteristics

 

SDO AWWA: American Water Works Association
Document Number B100
Publication Date Jan. 1, 2026
Language en - English
Page Count 56
Revision Level
Supercedes
Committee
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