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#6
02-29-2012, 03:44 AM
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GFO is Granular Ferric Oxide. I use PO4x4. It reduces your phosphates pretty fast and is rechageable (which is great because it isnt cheap). There are other types of GFO, but I find them messy...need a lot of rinsing. Biased because I used PO4x4 from the start.
Google GFO. For a quick fix you can use a liquid phosphate reducer if you have a skimmer. 
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