Wet/Dry overflowing with power outage?

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STUD

Jack Dempsey
MFK Member
Jan 11, 2009
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2
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MD
I remember hearing wet/dry filters overflow when the power goes out in your house. I have a 210 with built in overflows and the holes are in the bottom of the overflow underneath the tank. Is there a certain way to install the hoses to avoid the filter releasing the water in case of a power outage. I have no experience with wet/dry filters, so I'm trying to get everything correct to avoid issues. Thanks in advance.
 
Siphon breaks on your returns. Basically just a small hole drilled in it at or slightly under the water level so that in the event of power loss the hole will start sucking air instead of water.

Check valves can help too. I like both for added security but as long as your your returns are at or above the tank water level, you ll have little or no back siphon.
 
The overflows are drilled at the bottom of the tank, so the hoses will never be above water level.
 
When the power goes out, you'll get about an inch of water that drains down to the sump. When the water level clears the overflow box's teeth, it will stop. If the sump overflows with a power outage, it's one of 2 things:

1) Water level in sump is too high, or sump is too small to catch amount of spillover

which can also be caused by:

2) Returns are too far below the water level, and a causing a back-siphon. This can be fixed with check valves on the return lines or a small hole drilled right below the water level to break the siphon when the power goes out.
 
STUD;5133477; said:
The overflows are drilled at the bottom of the tank, so the hoses will never be above water level.

Are you saying the weir ( teeth) is at the bottom? If so then check valves for sure. My tank is drilled through the bottom, but the overflow boxes run all the way to the top. Some are made to drain from the bottom. I chose mine to drain at the top.
 
i think this one has been answered but i think jcardona is right when the water falls below the teeth of the overflow box than that's when the water stops. you should also have a big enough sump for the water to go. i'm running a 240 with a 60 gal sump and that is barely enough when the power goes out. then when the power goes back the pump puts back the water to the tank which will then hit that overflow box and start flowing again. also if you want to be extra cautious run a check valve.
 
Have a tall standpipe so all the water in overflows doesn't well overflow
 
The teeth are at the top, but each overflow holds 5gallons of water, so that's 10gallons that can drain into the wet/dry. I believe the system I'm getting is going to be sealed (meaning not opened at the top of the wet/dry), so I guess it'll keep the water in the wet/dry and the rest waiting inside the overflows.

I've never used a wet/dry, so I'm just trying to make sure all goes well. I'll try to find someone in my area with experience to help me out. Thank you all for the info.
 
brich999;5133998; said:
Have a tall standpipe so all the water in overflows doesn't well overflow

these work well i have them on one of my tank and they also quiet the sound of water. i'd look into putting one on each of your overflows, if not that water from the over flows are gonna drain into you're sump anyways. gl.
 
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