280g Inwall

[Delphinus]

Ah, mostly I was confused on the difference of using reduced amounts of GFO or not. Been using much less than the recommended amount at first but since the reactor outputs 0 anyhow. So I'm unclear of what's the point of adding more gfo at a time down the road, since the capacity to reduce PO4 can't really be any better than it is - except that "more gfo" should also mean "replace less often" .. but I'm kind of thinking it works out the same either way? Is the difference of 1 cup in the reactor, and 2 cups in the reactor .. the same as the difference of "replace every week" or "replace every 2 weeks"? Sorry I'm not a very good communicator so I have no idea if this makes sense or not.