Thread: New salt/ozone
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Old 01/06/2008, 08:28 AM
Randy Holmes-Farley Randy Holmes-Farley is offline
Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 52,068
Water changes almost always cause a drop in ORP. It is no concern at all. It just means that the balance of ions like iron are in more reduced forms (Fe++ compared to Fe+++). How much it happens and how long it last just depends on how many electrochemically active ions were present. I would also not conclude it is better (or worse) for it to go down less and bounce back faster.

FWIW, if the alkalinity is the same, the salt mix will not have any lasting impact on the pH. It is the interplay of all of the sources and sinks of CO2, along with alkalinity, that determines the tank pH.
Randy Holmes-Farley