ATO, Stop siphoning?

[calkrog]

Originally Posted by Pescador

As untamed said don't submerge the output to the sump and put a siphon break hole in the output line just above the water line in your ATO reservoir.

this is what i have done, my res is higher than my display and i top up in the sump. never had a problem.

[spreerider]

could you use a NC Solonoid valve