I use the Foz Down myself in my acro system. I used to use HC GFO but it got expensive quick. Foz Down is a very cost effective alternative to GFO. Some people choose to remove it with mechanical filtration but I personally don't worry about it. Into the overflow it goes and bye bye Phosphate.
Shelley I wish there was something like Foz Down for Nitrate but I haven't found it yet. ;-)
Cheers,
Tim
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