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.

[gregzz4]

Originally Posted by paddyob

Micro bubbles are a sump set up issue. Not siphon holes.

Ah, OK. I was concerned having the outlets semi-submersed would create bubbles. Guess I'll just have to wait and see once I add salt. It's not like I will have huge flow as it's just an Eheim 1262 with about 5-1/2' head. If it was a Mag 9 it would be just over 700gph, according to the RC head loss calculator.

Originally Posted by paddyob

Keep your skimmer in a chamber or two back from your return pump to "eliminate" them.

The skimmer is in the first section and behind a bubble trap. The first baffle is 16-3/4" tall and the last is 16-1/4"
Thanks Paddy