Ato siphon break help

[KStatefan]

Have the outlet higher than the water in your reservoir or install a siphon break in your reservoir

 

[DarthRaiderBob]

I was having this issue and moved my ato line up to my external overflow box on the back of the tank. Solved the problem for me.

 

[backbayreef]

The best solution is to have the outlet higher than your ATO. However, I had to buy this when using a kalk reactor since the water line is submerged and created a siphon.

Aqua Auto Smart ATO Replacement Siphon Breaker​

https://a.co/d/j7edKtf