Join Date: Jan 2013
Location: Southern California
As others have pointed out, you need the right flow rate in order to make the reactor work most efficiently. If the flow is too low, CO2 builds up in the reactor. If the flow is too high, bubbles get blasted into the tank.
My solution was to build a manifold with ball valves so i could adjust how much went through the reactor, my inline heater, and a bypass with just straight 1" PVC, all in parallel. This is on the output side of a FX5, and it works well for me.
With a much larger tank, you still may run into the problem of not having a big enough reactor, but at least you can try different flow rates through the reactor to figure out exactly what is limiting you.
In the picture, water flows bottom to top, with the inputs and outputs at the back of the cabinet (not shown).