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belly in the sewer line - ideas?

  • 23-11-2012 11:26am
    #1
    MuffinsDa
    Registered Users, Registered Users 2 Posts: 1,231 ✭✭✭


    We live in an old house and there is an insanely long and windy sewer pipe from the house to the septic tank. The line twists and turns numerous time, probably doesn't have a man hole, runs for around 30 meters without an access point, and there is an extension built on most of it.

    It regularly gets blocked too, and CCTV inspections has shown a "belly" or dip in the line some 15 meters down the way which seems to be under and extension. Obviously digging would be last resort. We were advised that regular flow and occasional jetting would clear it up.

    It was jetted about 3 months ago but it seems to be slowing up again as I can see water (still clear) building up towards the (only) manhole at the very end of the line (house side).

    I am considering my options here, and any advice would be greatly appreciated. Here is my thoughts/questions:

    1. Anyone know what would it cost roughly to do a proper repair on the dip part, i.e. digging it up and fixing the line. Say the dip is for less that a foot run. I know it depends but I just need to know whether it's in order of 100s, 1000s, or 10000s!

    2. Has anyone tried using a sewer jetter attachment with pressure washer and DIY this kind of work? do they work or do I risk making it worse? I was thinking maybe if I jet it on a monthly basis myself it may stop blocking...

    3. Another idea I had: the mains pressure is really high in our house. Is there any thing against running an ordinary hose down the line until it reaches the blockage and then opening the mains to full and see if it can unblock it? All it costs is a 30m length of flexible hose. Do you think ordinary garden hose would be flexible enough to go through multiple bends? Is there any risk of it getting stuck there?

    4. would putting a saniflo pump help in anyway?


Comments

  • #2
    shane0007
    Closed Accounts Posts: 4,677 ✭✭✭shane0007


    I would go for option 1. Of the hump is only a foot long, why not just put in an AJ inspection box with lid at that point. That would eliminate the hump and give you ridding access in both directions from that point.
    It would also be a cheap option.


  • #3
    deandean
    Registered Users, Registered Users 2 Posts: 2,257 ✭✭✭deandean


    Once there is any bit of a dip, you have a problem: water will hang around in the dip, and eventually lead to a blockage. The drain needs to have a fall all the way along so the water keeps moving.

    So you are gonna have to get rid of the dip.

    Providing there's not a house built on top of it - i.e. if it's on the driveway, get a builder to:
    - Make opening
    - Fix the problem
    - (preferably) install a manhole there to allow future access. The big one (about
    700mm square) is better for rodding than the small 300mm sq one.
    - Make good.
    Budget 500 Euro.

    Have you had a drain survey? The lads with the camera should be able to tell you how many metres to the dip, so you can dig in the right place.


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