When to replace gfo

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Scotty Fraiser

Aquarium Advice Activist
Joined
Mar 18, 2013
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175
How often do you replace Gfo in a reactor in a reef tank. If the answer is when phosphates rise approximately how long does that take? 110 gall reef with 35 gall sump. I am running 3 cups of Gfo in reactor and a little carbon.
 
I have a 60g display and 30g sump and use 2 to 3 cup in my BRS reactor and swap that out every 2 -3 weeks. I'm probably wrong do so but haven't had any ill effects . I have my tank up a little over a year now but the reactor just the last six months .
 
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