Ato help!
 

So I set up my tunze 3155 , now the problem I'm having is once the pump stops it basically all pours back in to my ato tub . Did I not put something on. ? Any help would be awesome


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Is your line below the water surface? Sounds like its syphoning back - raise the line above the water level and you should be fine.

+1

Is the line from auto top off basin to tank submerged below the water line? I did the same thing and siphoned back to the top off basin. Throwing my salinity out a bit....

Yes that's what it was pulled it out right when I posted this, gave myself a slap in the head lol , obviously wasn't paying attention when I installed it


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