[howdy20012002]

Step 7
the only left to do is to set this up with your tank
I personally just stuck an airhose into the tank and connected that (after I started a siphon) to the denitrator using the quick disconnect union on the end of the airline tube coming out of the top of the denitrator.
Gravity then took over and filled up the 3 foot PVC denitrator (took about 10 minutes with just gravity feed)
I then connected a airhose to the quick connect valve with the control valve on the top of the denitrator.
After the tube was filled up, the water came up thru the exit valve and back to the tank through the airhose.
As long as the end of the tube is lower than the output on the denitrator, then gravity should work
If you don't have a sump, a pump would do the same affect and would allow the water to be push back up into the tank.
I adjust the flow of water to where it a constand, fairl rapid drip back into the tank.
the water outflow needs to be slow so that the bacteria has time to consume the nitrates. If it is too fast, there isn't enough contact time.

You could a pump of some sort to feed the denitrator if you don't like the idea of gravity feed.