Products like Fozdown scare me. First off, you have to get the dosing 100%. Too much by accident is disastrous.
Second, any precipitate you don't pull out with filter socks settles in the rocks and what not. What happens to it over time? I've heard lots of anecdotal incidents to give me pause.
So far my experiment with dosing carbon, bacteria and NaNO3 has been wonderful. NO3 and PO4 are both verging on ULNS with no GFO and it's cheaper than even Fozdown. I'm certainly not the first to do it, just seems alot haven't caught on to keeping NO3 and PO4 BALANCED rather than just close to 0.
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