How to stop ato siphon.. Will this work?

[14 foot reef]

Since your ATO looks like its NOT in a finished living space, what i do is put a tee in the line and run it up to the ceiling attache to wall so it doesn't fall. no ato woll pump up that high when the easiest exit is your ATO resevoiur. As soon as ATO shuts off, the tee line to ceiling breaks siphon. $2.00 investment in a John Guest tee.

 

[Capt_BigIron]

A really good way to ensure your siphon breaks is to drill a small hole in your tubing right before it leaves your reservoir, that way when the pump shuts off the air stops any siphoning yeah a little water pumps back into your reservoir but it beats a tank crash from salinity drop

Solid answer and years later you saved me. I couldnt figure out why my sump level kept rising. Once I figured out the culprit, I needed to figure out the fix. You were dead on. Thank you

 

[Crabs McJones]

You're welcome. Glad I could still be of help to someone

Solid answer and years later you saved me. I couldnt figure out why my sump level kept rising. Once I figured out the culprit, I needed to figure out the fix. You were dead on. Thank you