Originally Posted by mr_X
If light can't penetrate the drain, it's not likely that it will be clogged, unless there is a snail shell stuck in it or something.
after head loss is probably around 500 gph
or so. If your HOB
is a 600 gph
overflow, there's your problem.
Ok, thks! I'm going to do a test on my overflow to see how fast it's flowing. My LFS
told me how to do it. So... if my overflow doesn't match my return, that's the prob?? So better to speed up overflow to match return rather than slow the return?? I haven't had a bubble show up lately. That's why I say there's no rhyme or reason! I'm sure there is a rhyme or reason, I just can't figure out what it is. My LFS
said make sure the J-tube isn't near the back box's down spout b/c if it causes like a whirlpool effect, it could be throwing some air up the j-tube.