Høye konsentrasjoner av vannets hardhet kan gi bruksmessige problemer.
Hardt vann skyldes hovedsakelig høy konsentrasjon av kalsium (Ca) og magnesium (Mg). I Norge har man lite hardt vann, men det forekommer i enkelte grunnvannskilder og for det meste i områder med kalkrike bergarter. I Nordland, Troms og Finnmark og i en del av østlandsområdet finnes kalkrik berggrunn, og grunnvannet i slike områder kan være hardt og alkalisk.
Norske vannverk oppgir hardhet i tyske hardhetsgrader (°dH) eller i milligram kalsium per liter (mg Ca/l, inkludert magnesium).
Et optimalt innhold av kalsium vil normalt ligge mellom 15-25 mg Ca/l. I dette området vil ikke de bruksmessige problemene være vesentlige, samtidig som andre hensyn, som å begrense korrosjonsproblemer blir ivaretatt.
I hardt vann er det mye kalsium og magnesium som gir et gråhvitt belegg på glass, kjeler, i kaffetraktere, vaskemaskiner og oppvaskmaskiner. Belegget kalles kjelstein og består av kalsiumkarbonat (CaCO3). Slike avleiringer kan føre til energitap og skade på elektriske varmeelementer. Ved vasking vil man dessuten oppleve at såpe skummer dårlig og man vil normalt forsøke å kompensere med å bruke mer såpe. I bløtt vann er det mindre kalsium og magnesium. Såpe og rengjøringsmidler skummer bedre og blir også mer effektivt.
Flaske: 500ml steril flaske (inkludert i prisen).
Analyser:
Se teknisk informasjon for videre analysebeskrivelse og metode.
695 kr
Standardmetode: NS-EN ISO 17294-2
Vannets hardhet baserer seg på innholdet av kalsium og magnesium. Det er ikke satt noen grenseverdi for kalsium og magnesium, da det ikke er registrert negative helseeffekter av kalsium eller magnesium i drikkevannet. Bruksmessige problemer vil derimot bli særlig merkbare når kalsiuminnholdet overstiger 25 mg Ca/l og problemene øker ettersom hardheten øker.
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