Thread: How long for GFO to work on algae? A report.
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Unread 11/30/2017, 04:45 PM   #8
heathlindner25
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Join Date: May 2012
Location: flowery branch georgia
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Quote:
Originally Posted by hkgar View Post
You can test the effectiveness by checking the PO4 of the water coming out of the reactor. If it is lower than the tank, it is still working, if the same, used up
This is the only way to know when to change it .


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