Hopefully, last ATK question

[willist0]

The ATK is working, kind of, last night it over filled my sump. the float switch stopped it, so that works. But what I don't know is should the slider on Fusion be on Auto or On I'm guessing Auto, right? Hey guys just wait til Monday when I try to link my Hydra 26 HDs. Thanks for the help.

 

[Darrell Brady]

Auto

 

[Mical]

Auto

 

[homer1475]

Lol I see this question more times then you can imagine.

Think of it this way....

Auto means just that, automation mode. Or simply put, it will run on its programming.
On is just plain on. Like a wall outlet, it's always on.
And off is obviously off.

 

[SuncrestReef]

If you want a full understanding of how your ATK works and how to tune it for your tank, see my ATK tutorial:
https://www.reef2reef.com/ams/neptune-apex-programming-tutorials-part-3-automatic-top-off-kit-atk.692

And bookmark it in case you need to troubleshoot in the future.