Hardwater

[robert clements]

done a water test today alls fine but will hardwatermake the diffrance to yhe test

 

[fluttermoth]

Simple answer; no; the test are designed to work at all hardnesses (although they won't work for salt water).

 

[KittyKat]

(although they won't work for salt water)

That's what I thought, until I bought the API freshwater and marine master test kits: I could have saved some money by getting just one! The reagent bottles even have the same batch number on them.