The purpose of this standard is to provide the minimum requirements for precoat filtration media, including physical, chemical, packaging, shipping, and testing requirements.<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003Precoat media filtration is a process in which the filter media, typically diatomite or perlite, are applied to a support structure, used for filtration, then removed and disposed of on a cyclic basis. This process is unlike granular-medi I.B.\tHistory.\u2003ANSI\/AWWA B101 was approved as a new standard by the AWWA Board of Directors on June 23, 1994. Subsequent revisions were approved on June\u00a017, 2001, June 10, 2012, and Jan. 16, 2016. This edition was approved on Oct.\u00a024, 2022. I.C.\tAcceptance.\u2003In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | II.\tSpecial Issues. II.A.\tStorage and Handling Precautions.\u2003Diatomaceous earth (DE) is a silica product; prolonged breathing of excessive concentrations of its dust may cause lung damage. Most grades of DE used in filtration contain crystalline silica, which may cause silico III.\tUse of This Standard.\u2003It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. III.A.\tPurchaser Options and Alternatives.\u2003The following items should be provided by the purchaser: <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | III.B.\tModification to Standard.\u2003Any modification to the provisions, definition, or terminology in this standard must be provided by the purchaser. IV.\tMajor Revisions.\u2003Major revisions made to the standard in this edition include the following: V.\tComments.\u2003If you have any comments or questions about this standard, please contact AWWA Engineering and Technical Services at 303.794.7711, FAX at 303.795.7603; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or email at sta <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | AWWA Standard SECTION 1:\tGENERAL Sec. 1.1\tScope Sec. 1.2\tPurpose Sec. 1.3\tApplication <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | SECTION 2:\tREFERENCES SECTION 3:\tDEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | SECTION 4:\tREQUIREMENTS Sec. 4.1\tPhysical Requirements Sec. 4.2\tChemical Requirements <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Table 1\tTypical physical properties of precoat media used in water treatment Table 2\tTypical chemical properties of precoat media used in water treatment \n(values presented as percentages) <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA B101-22 Precoat Filter Media<\/b><\/p>\n |