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Help with Macerator toilet waste pipe

Discussion in 'Plumbing and Central Heating' started by Barry378, 29 Jun 2020.

  1. Barry378

    Barry378

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    hi, I have recently purchased a property with a workshop in the garden which I am converting Into an office.

    The workshop has a 110mm soil Pipe sticking out of the concrete base in a corner which I was told by the previous owner was put in place for a possible toilet in the future.

    This soil pipe connects to a man hole by my house which is about 25 meters away. I plan on putting a toilet in my office, but I decided to test the soil pipe as something didn’t sit right with me. So I got a friend to poor water from a bucket to see what would happen.

    The water eventually came to the man hole but was at a very slow pace and I am now not confident the gradient of this pipe will be enough to push human waste.

    My plan now is to install a macerator toilet and feed the waste pipe through this soil pipe until it reaches my man hole?

    Is this a good idea? Can it be done? If so what would be the best pipe?

    Many thank
     
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  3. Jackrae

    Jackrae

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    Macerator and your idea is wrong on so many levels
    Why not repeat the test but this time use a lump of dog sh1t, a few sheets of toilet paper and a bucket of water equivalent to a full toilet flush (2 gallon ?) all poured in a fast as possible to represent a real flush + solids situation.
     
  4. Hugh Jaleak

    Hugh Jaleak

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    A wad of toilet paper will suffice to test the drain, no need to go looking for dog deposits! 110mm pipe is a far superior solution to a macerator, and I'd sooner be unblocking the pipe than a macerator any day of the week.
     
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  5. Hugh Jaleak

    Hugh Jaleak

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    To add, you can get away with a little as a 1:100 fall on a new drain, pipes are smooth bore so the waste doesn't catch so easily. Given you'll probably have some sort of basin or sink for hand washing/making tea nearby, the extra flow from that will all help to wash the soil from the WC through. A belly (dip) in the pipe would be a bigger issue.
     
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  6. Barry378

    Barry378

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    Thanks I’ll give the toilet paper a test, Iv done some research and I believe the fall/gradient should be between 1:4 (1cm for every 40cm) which is 62.5cm fall and 1:110 (1cm for every 110cm) which is 22.7cm fall.
     
  7. Jackrae

    Jackrae

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    Don't forget that it takes time for water to flow through a pipe so don't expect an instant response between the inlet test point and the manhole - it could be several seconds. What you're looking for is a decent rate once the flow starts to appear.
     
  8. Hugh Jaleak

    Hugh Jaleak

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    The 1:40 was an old rule of thumb for 4" pipes back in the day. The Sanitary Inspector would come and roll a ball down the line once the drain was laid, if it got stuck, the drain failed and had to be redone.

    Modern plastic pipework is much smoother internal bore as I said above, 1:100, (so 1cm per metre) is an absolute minimum fall, anything less and you will have issues. Likewise 1:40 for 4" pipework is an absolute max ideally. You're looking to achieve a 'Self cleansing velocity', whereby the water carries the solids with it. Too steep a fall and the water runs away leaving the solids behind, too shallow and the solids get stuck, leaving the water to seep away.
     
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  9. just pumps

    just pumps

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    The macerator would run out of puff over 25m.
     
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  11. just pumps

    just pumps

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    2 gal = 9l
     
  12. dilalio

    dilalio

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    You could also put in a wc with a high level cistern... After all, our sewers were designed with these in mind.
     
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  13. Jackrae

    Jackrae

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    What difference will that make, the toilet pan disconnects the cistern, be it low level or high level, from the sewer ?
     
  14. HERTS P&D

    HERTS P&D

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    The force of gravity is greater.

    A bit like removing an air lock from a downstairs basin rather than the upstairs bathroom.

    Andy
     
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  15. dilalio

    dilalio

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    You obviously don't get much "head" :whistle:
     
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  16. Hugh Jaleak

    Hugh Jaleak

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    I still find it an 'experience', on the odd occasion I come across one. A few of our sites still have one in use, Grandparents had one in their outside WC, (was still there when my Granny left that house after 40+ years to move into sheltered accommodation). Flush was/is shorter, more powerful and devastatingly effective. Nothing's would dare hang around with that behind it. :LOL:
     
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  17. dilalio

    dilalio

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    I'm a big fan of Bazalgette :D
     
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