size of hole in the return line?
i just finished plumbing my sump. to break siphon in the event of a power failure, most of the people on this site have recommended drilling a hole just below the waterline on the return tube. what size hole are most of you drilling.
also, i understand that the hole will break siphon on a power outage, however, what about when the power comes back on. the overflow will begin filling up again, but the it will have lost siphon when the return pump went off and when the pump restarts it will not return water to the sump, thereby overflowing the main tank.
- 75 gal
Amiracle SL-350 Wet/Dry (no bio-balls)
AquaC EV-180 Skimmer w/Mag 7
2ea Maxi-Jet 1200 & 2ea Maxi-Jet 900 PH
Captive Purity Refractometer w/Calibrator
LCD Digital 250 W Titanium Heater
48in Coralife 4x65 watt PC
Won Pro Heat II
Tunz level alarm
Approx. 200lbs Sand (3-4" DSB
unit - 110 GPD
Please feel free to advise me!