I have used lanthanum chloride, I used an IV dropper and dosed into my overflow tube, about one drop every 3-5secs, I put a 5micron filter sock on my drain tube. It helped lower my PO4, once I got it low enough I went back to gfo because of the ease of use.
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60x36x24 mixed reef. 40b sump. Regal 250int Varios. 4xHydra26HDs+t5s. 4xMp40wes. Apex2016.
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