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[QUOTE="IslandLifeReef, post: 10253374, member: 85814"] Flow through the GFO will have a significant impact on its ability to remove PO4. You don’t need to test so often, maybe twice a week at the most until you get it to a level you are happy with. If you are unsure about your test results, you could always send out an ICP test. I would recommend testing your water yourself at the same time you take the sample for the ICP test so you have an accurate reference to compare the results with. [/QUOTE]

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