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Originally Posted by tosiek  |  | | | | | | | | | There is a ball valve on the line going down. I don;t want to reduce the drain in a chance of it overflowing my tank =0) | |  | |  | |
This is my thoughts on this and somone correct me if I'm wrong.
Many years ago I built and setup a W/D with an OFB for a friends FW tank. I used clear flexible tubing to connect the OFB to the W/D. I had installed a ball valve on the W/D intake and one on the output of the return pump. The initial settings had both valves wide open.
Upon starting it up I had to throttle back the return to balance things out and let it run about an hour to make sure it stayed in balance. The OFB was making the normal amount of noise everyone complains about. The noise was obviously air getting sucked into the drain, it was visible through the flexible tubing.
I then figured the flow was to fast through the OFB and would not allow the bubbles to fight gravity and then throttled back the OFB until the trapped bubbles could defeat the flow and rise up the tubing. I then played with this valve until I got it to where it was running as far open as possible without allowing air to enter.
After doing this, the return pump needed to be opened as the balnce was off again, this time in favor of the OFB. I opened up the return and got it balanced again.
To me this means you are actually losing flow by allowing air to replace some of the volume available, that should have water in it. In other words adding a valve to restrict air from entering the tubing, you actually are increasing your flow.
Am I correct in thinking this is true?