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Old 12/21/2007, 08:35 AM
Randy Holmes-Farley Randy Holmes-Farley is offline
Reef Chemist
 
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 52,068
Do you dose anything?

The top off water from the RO had 80 ppm alkalinity? That seems very high and may be the explanation if demand in the tank is low.
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Randy Holmes-Farley