Mash Recirc and grain bed compression

[TennBrewer]

I'm doing 5 gallon batches in an eBIAB system with recirculation. The wort is returned to the grain bed through a tube with holes along it from top to bottom. It seems that when wort is streamed out these holes several inches above the grain bed it oxidizes the wort and gets a bad off-flavor. Do I need to keep the recirculated wort returning below the surface?

 

[mongoose33]

I'm doing 5 gallon batches in an eBIAB system with recirculation. The wort is returned to the grain bed through a tube with holes along it from top to bottom. It seems that when wort is streamed out these holes several inches above the grain bed it oxidizes the wort and gets a bad off-flavor. Do I need to keep the recirculated wort returning below the surface?

That's what I do with mine.

 

[whovous]

I'm doing 5 gallon batches in an eBIAB system with recirculation. The wort is returned to the grain bed through a tube with holes along it from top to bottom. It seems that when wort is streamed out these holes several inches above the grain bed it oxidizes the wort and gets a bad off-flavor. Do I need to keep the recirculated wort returning below the surface?

It can be a bit of a hassle to get the tube to stay under water, but it is definitely doable. I'm assuming you use the same blue and orange snap together contraption that I use.