I completely disagree. Its a great method and on four tanks, in as many years Ive never had a sump flood using it. Its how 99.9% of reefers plumb thier tanks. Its basic plumbing. On my first tank, I found the drilled siphon breaks to be undependable and then started just plumbing my returns to only sit and inch or so below the water level. Its guaranteed to work as long as the tank is in your house, maintanance free.
Why does a person need to plumb the returns four inches below the water level in the first place? Ive plumbed several very large systems for myself, friends and have seen a ton of others. I wouldnt recommend plumbing it this way. Its guranteed to flood, maybe not right away, but over the years, it will. NO matter what kind of fancy electronics you use.
No I meant that my design on the tank was not implemented as well as I hoped...