I used to buy the regular gfo from brs but it got expensive so I gave the stuff on ebay a try and had the exact same results so now I save a bunch of money and keep my phosphates down. Here is what I buy
Dude...high cap gfo is way worth it...i was changing the regular gfo every 3 weeks...
I get 16 weeks out of the high cap gfo....it does get hard so you need to turn up
the pressure as the weeks go on...
Gfo is granular ferric oxide and it removes only phosphates from the water. It works best when run in a media reactor because if it isn't kept under a good amount of flow it will clump up and not allow the water to run through it
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