Grey holding tank blocked

Discussion in 'Tech/Mech General' started by Soaringman, Nov 15, 2012.

  1. Soaringman

    Soaringman Funster

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    Hello all
    The title shows the problem, my grey tank is emptying very slowly.
    I have found an inspection hatch in the top but the tank is so long I can't get my big arm all the way inside.
    When I put a hose pipe in on high pressure, I can dislodge the blockage for a while but then it finds its way back:Angry:
    Is there something I can put into the tank to devolve it? It must be food or leaf or something.
    Help please
    Martin
     
  2. hilldweller

    hilldweller Funster Life Member

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    Bio washing liquid.
     
  3. MikeandCarolyn

    MikeandCarolyn Read Only Funster

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    Sounds as if whatever is blocking it can move around-so,if you raise one end of the van so that whatever it is comes to the end with the 'inspection cover' you should be able to see it and get it out :BigGrin: maybe,hopefully.:BigGrin:

    Mike.
     
  4. scotjimland

    scotjimland Funster Life Member

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    caustic soda
     
  5. wiljoy

    wiljoy Funster

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    Hi Martin, I had the same problem a few years ago and it was caused by a build up of fat and other nice things we wash down the sinks. I half filled the tank with water and added some caustic soda. Went out for a short drive to rinse it about and then drained it out. The problem was solved after I pulled out a large piece of fat/food mix from the inspection hole. When finished rinse out the tank again and hopefully it should work.
     
  6. peter marshall

    peter marshall

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    Hi Martin
    I use a bottle of coke that seems to get all sorts of rubbish out. Pete
     
  7. maz

    maz Funster

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    Soon after I got my van a black plastic disc about the size of a 10p piece came out from the grey tank into the bucket. I'm guessing it fell into the tank at some point during construction. Just wondering if you've got something like that lurking?
     
  8. rainbow chasers

    rainbow chasers Read Only Funster

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    Sounds like you have alot of crud building up. You will need to get some bio washing liquid in there or similar - works well, go for the aldi 5 litre one. You can use in your loo too!

    Let that soak overnight, and it should clear. You may need to check your traps and clean them too, as they may be blocking also.
     
  9. keith

    keith Funster

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    Reverse flushing always works for me. I just push a hose up as far as it will go then let the tank fill, you may even find the lump of crud in your tank after.

    Don't let HID flush so much fat drown the drain -- that's if you are brave enough to tell her. :hardhat:
     
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  10. peter H

    peter H Funster Life Member

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    I used mr muscle sink and plug hole unblocker
     
  11. Soaringman

    Soaringman Funster

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    Thanks for all of the suggestions, I thought caustic soda might harm the plastic:Sad:
    I think I need to try it, I suppose any other sink unblocked should work too.
    I would use coke, but then what would I put in by JD:Wink:
    Is caustic soda or normal sink unblocker ok for the traps as well ?
     
  12. Soaringman

    Soaringman Funster

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    The only reason I am so cautious is because when we had the B&B, we had a commercial dishwasher that was emptying slowly, so down went the drain unblocker, and disintegrated the internal hoses:cry:
    Cost £200 to repair:Doh:
     
  13. scotjimland

    scotjimland Funster Life Member

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    Caustic soda is fine with plastics, it's the main chemical of most drain unblockers and some oven cleaners.. . but it does generate quite a bit of heat, hence your melted dishwasher hose..

    I also had some misfortune with it.. It is great for cleaning fat from frying and chip pans.. I left it too long and it attacked the aluminum .. damn near ate through the pan :Laughing:

    Mix in the sink, then drain down to the tank, run fresh water to clear it from the pipes and fill the tank.. .. leave overnight then drain out..

    NB **follow the instructions on the packet and please wear safety glasses, or better still safety goggles and also rubber gloves, it can cause severe skin burns..**
     
    Last edited: Nov 15, 2012
  14. chatter

    chatter Read Only Funster

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    once you have cleared the problem, remember to keep a small bottle or similar to tip cool oil/fat into, and plenty of kitchen roll to wipe plates off before washing. Also if you can use sink strainers as loose hair from washing it going down the drain will also help the fat to collect in lumps
     
    Last edited: Nov 15, 2012
  15. pappajohn

    pappajohn Funster Life Member

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    sound like a grease 'ball'.

    only way into the tank is via a sink or shower drain so the 'item' should be small enough to pass out the outlet pipe/tap.

    a grease ball will build up over time and could be too big to pass out.

    you have access to the service 'hatch' so try a couple of pans of boiling water and bio liquid through the hatch..cold/warmish water wont dissolve grease.

    leave a few minutes then drain down.
    probably need to repeat a few times.
     
  16. MikeandCarolyn

    MikeandCarolyn Read Only Funster

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    Doesn't the bottle cause a bit of a blockage? :BigGrin:

    joking apart-there is a product by Thetford for this problem-it is Thetford Grey Waste Freshener.It dissolves grease etc and certainly makes our sinks drain more quickly and has cleared our Grey Tank of a black coating that it had when we got the van.
    If the blockage is being caused by a non-dissolvable something,then you will have to find a way of getting that 'something' within reach of the inspection hole.:BigGrin:

    Mike.
     
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  17. peter marshall

    peter marshall

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    Hoop's I never thought of that, but I did put a bottle of coke, not a coke bottle. Pete :Wink::Wink:
     
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