I think the concept of a reactor is different to different people.
My definition of a reactor is more then piling a bunch of Kaldness into a baffled sump. This provides little contact time. I'm sure it would work but efficiency is what we're all after. I didn't spend a buttload of money on fancy media to not use it to it's maximum potential.
I'll post pics when I get home to my hard drive.
I am running BOTH my reactors with 1000 GPH pump BEFORE any headlosses. This is split between the 2 reactors. This means 500 gph each. IF I'm 450 after loss, then at that flow rate it's going to take over 7 minutes to fill that reactor, which means the water entering the bottom of the reactor should be in there for 7+ minutes. Now I'm sure this isn't super acurate but we need means to compare things so I'm just breaking down with simple math.
I have my water entering the bottom of the 55 gallon drums in PVC cut at an angle to allow the water to follow the wall of the drum, similar to a vortex chamber. After several days of testing how to get best results with the "boil" I sent most of the air out to the edges of the barrel.
You need a VERY large airpump to make things work right. I bought the biggest pondmaster air pump and planned on using it for the reactors and everything else air wise in my system. Needless to say I think I could actually use more.
I built my reactors using Aquatic eco system.com's specs on the one's they sell turn key. This is VERY important for figuring how much media to use, flowrates, CFM required, etc.
Based on thier specs I think I can feed up to 6-7lbs a day with my 2 reactors. I don't see myself ever needing to feed that much even if all my rays were in the same tank and fullgrown. I will be adding thier "bio chips" to the reactors later on down the road when I have more then 3 rays in my 750. lol
I'll get some pics up tonight then hopefully this will all make more sense. Might even just start a new thread if I didn't think it would just result in a pi$$ing match.