reversal into sump after loss of Power...help

[sancochojoe]

What do I need to do to prevent the water reversing back into the sump if I lose power and flooding my floor????

Thanks.

[reseter5]

get a one way check valve.. lets the water flow in one direction only.. when it reverses it gets blocked....

[sancochojoe]

get a one way check valve.. lets the water flow in one direction only.. when it reverses it gets blocked....

Is that a home depot item product or something I get at an aquarium store and can you point me to an online site that sells them?

Newbie here, have no clue.

[hopkins11]

If you have a hang on back diffuser drill a small hole just below the water level. This way, the suction is relieved once the level gets that low and the siphon is broken.
-Worked for me-

[Reefland]

Well, another opinion here. You should operate your sump with a water level that allows for any tank drainage during a power outage. You might find something in here helpful:
http://www.reefland.com/rho/2006/05/overflows_sumps.php

[The R/C Man]

Scott hit the nail on the head. Ensure your sump has sufficient room for the drainage from the display. To find this out you need to measure the depth of your returns and/or overflows (witch ever is deeper) into your tank. So it would be the depth times the leangth and with of your tank divided by 231. That will give you how many gallons extra capacity your sump will need to hold. Drilling small holes in lines will work provided they are routinely kept clean....