scope:

This standard describes diatomaceous earth (DE), perlite, and other disposable filter materials used to precoat filters for water supply service application.

Purpose

The purpose of this standard is to provide a guide for evaluating precoat filtration media. The criteria in this standard should be used to determine if this media is similar to the product used currently to produce potable water in a specific water treatment plant or pilot project. Extensive use of DE and perlite by the water industry supports the need for this standard.