I added too much water after the boil, fermented, and dumped it all in the keg. It's pretty near the to the top.
Is there any downside/danger to this, or can I put psi to 30 and not worry?
If your level so high it is covering the gas-in dip tube you can get beer in your gas lines.
Never underestimate the potential of someone who refuses to act their age.
If the pressure drops, yes, it will push beer back up the gas line. You should have a check valve on your gas line to prevent that though. It's not ideal, but the first pour will take care of it.
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I fill to about a half inch below the gas dip tube.
Thanks. It is far enough from the gas dip tube I think it will be ok.
So this begs the question... Where is the 5 gallon mark? Right to the lid? The end of the dip tube? Lower?