I have never used GFO. I use ROWAPhos and Chemi-pure elite.
I should change up my RowaPhos tonight and do a water change.
I will test my PHOS agaon wioth my Hanna checker.
I also did buy SeaChem Phosguard but I have not used it yet.. Not really sure the amount to use or the best way to use it.
I run my Rowaphos in a TLF 150 reactor.
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