I've been running biopellets for over a year now and noticed that they alone could not strip out enough phosphate from my system. I now run GFO as well and have a phosphate reading of 0.01 on the Hanna checker. Before running GFO I had something like 0.08 to 0.11. A lot of people don't recommend running GFO with biopellets but it seems to work out fine for me.
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