Dont forget about gravity.

[brendan12]

so funny story i got my new ATO for my jbj 30 gallon set it up and worked great. stood there for a few minute fine tuning stepped back to look if i was happy with the water level and i could see it dropping took a few seconds to find out what i did i left the end of return line under the water line creating a issue :bigsmile: it almost over filled my fresh water container under my stand oops

 

[Naiad]

I did that too with my first ATO system. You would think I have filled enough buckets to remember that happens.

 

[mfief]

I did it a few months ago setting up my ato