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Thread: Septic Question

  1. #1
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    Default Septic Question

    I don't see many septics in my area but recently I've seen two with the same issue. The main house trap appears to be air locked even though the fresh air vent is clean and operating. Allow me to explain: I got to a job yesterday and the home owner wants his main line cleaned as preventive maintenance. The house trap has the original brass caps and I can't unscrew them. I begin to chisel off the trap in side and as soon as I puncture the cap, water seeps out and I can see that trap in is full of water. I think to myself for a second "Hmm...maybe this line is clogged." So I begin to chisel the trap out cap. As soon as I puncture that cap I hear air rushing in/out and the entire line begins to empty. No stoppage. I snake the line as usual and run plenty of water. No issues. This is the second time I've seen this occur, both times the septic was recently pumped. Like I said I rarely ever deal with septics. Is this normal? Can someone explain to me why this occurs? Both house traps have a fresh air vent located at the first fitting before the house trap. Both air vents were clear. Could this be an air lock type of thing and if so, how is that possible with working vents?

  2. #2
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    Default

    NYC
    I probably do at least 3-4 septics a week and I have never seen this. Wish I could help you out. My area (rural) we have plenty. Most of them here have C/O on the tank or (now) they have to have manholes put on the lids. I don't know if this would help the air problem but it makes a little sence that it could.
    Wilson's Roto-Rooter
    Hannibal, Mo

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    The house trap makes it a whole different show...
    The septic tank is a closed container so by rights it should have vent on the tank side of the trap to allow air to escape.
    However, once the tank is filled the level in the tank doesn't really change.
    A little water goes in and a little water goes out to the leaching fields.
    The liquid level in the tank is determined by the outlet height...
    So the air in the tank stays pretty constant...

    When the tank has been emptied there is a lot of air that needs to go someplace as the tank fills.
    On a home without a housetrap this air would vent through the roof...
    So a home with a housetrap is really one of the only places you'll see this or perhaps on a bellied line...
    "99% of Being Smart...
    Is Knowing What You're Dumb At"


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    NYC drain guy (04-24-2014)

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    So that being said, now that the tank is full if I were to remove the caps again, then I shouldn't get the same air reaction?

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    Redwood (04-24-2014)

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    I don't think you'll see the air outflow again now...
    "99% of Being Smart...
    Is Knowing What You're Dumb At"


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