<a href=showthread.php?s=&postid=8354284#post8354284 target=_blank>Originally posted</a> by rscott76
forget the check valve..it may slow it down but the chance of it sticking is pretty high. just use the regular failsafes...
drill 2-3 siphon break holes in the return tube so that if a snail can cover 2 at the time of the power loss there is still one left.
dont fill the water more than the sump can handle when the power is off...fill the display, fill the sump to the brim then turn it on. when it hits equillibrium mark the water level. you shouldnt fill past that or the same thing will happen again.
Make sure your overflow box isnt leaking allowing more water to trickle in and in turn more water to drain.
please do NOT shortcut these things. power goes out all the time here and i have never had water overflow. you shouldnt be having these problems either.