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

[gregzz4]

Wow, I should have checked in yesterday

Originally Posted by paddyob

How do you know how long this person has been in fish keeping.

I guess I won't offer advice.

All I meant was ensquire gave no reference as to how long the loc-line had been in use.
My reply wasn't meant to imply anything else.