Designation:D8422−21StandardPracticeforPre-StressingTerminalPoint-of-UseWaterFiltersbeforeTestingbyTestMethodF8381ThisstandardisissuedunderthefixeddesignationD8422;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversterminalpoint-of-use(POU)filtersintendedforintermittentuseonshowers,faucets,andotherwateruseend-pointdevicesthatdeliverhotandcoldpotablewater.1.2Thispracticedoesnotcoverin-linefilters.1.3Units—Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterF838TestMethodforDeterminingBacterialRetentionofMembraneFiltersUtilizedforLiquidFiltration2.2ISOStandards:3ISO13485Medicaldevices—Qualitymanagementsystems—Requirementsforregulatorypurposes3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1in-linewaterfilter,n—deviceinstalledonthewatersupplylineupstreamofawateruseendpoint,suchasashower,faucet,oricemachine,forthepurposeofremovingcontaminantsfromthewaterbeforethewaterentersthewa...
