Opinions appreciated: check valve vs anti-siphon holes in overflow returns

[paddyob]

Originally Posted by gregzz4

Thanks, that's what I suspected
I'll try my latest configuration and am still contemplating drilled holes, but only as a backup.
I have a lifetime subscription to Back-up magazine but am also trying to go with the KISS method.
Because I haven't tested my system yet with salt, I have no idea what kind of micro bubbles I may end up with due to my current config. This is why I'm leaning towards no holes.
All I can do is try it and worst case I replace the drilled pieces, right?

Holes on the end of your output will lose micro bubbles the same as the siphon holes.

Micro bubbles are a sump set up issue. Not siphon holes. Keep your skimmer in a chamber or two back from your return pump to "eliminate" them.