FAQ: Will Seachem CupriSorb™ affect my pH, GH, or KH?

Under ordinary circumstances of use, no it will not.  CupriSorb™ preferentially absorbs metals and does not release any components capable of altering KH or pH.  However, in the case of gross overdoses in water with an exceptionally low GH which does not actually contain any metals, CupriSorb™ can have a minor but noticeable impact on GH.  This occurs because, in the absence of copper and other metals, CupriSorb™ is capable of binding to calcium instead.  Under ordinary circumstances of use, this change either does not occur (as the CupriSorb™ preferentially binds to metals) or is so small as to be undetectable to both test kits and aquarium inhabitants.