will low flow toilet work on old septic system?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Ten High, Mar 3, 2012.

  1. Ten High

    Ten High New Member

    Messages:
    3
    Location:
    Upstate New York
    Theoretical question:
    Have a 1950s (6gallon?) toilet (Crane) on even older septic system. I am wondering if a modern 1.6 gallon toilet will work with this old system. here's the existing setup:
    From upstairs toilet, waste pipe has a vertical drop of about 12 feet to right angle turn , then pipe goes horizontal about another 12 feet to another right angle turn, then a horizontal straight run of almost 30 feet out of the house and continuint straight another 20 feet or so to the concrete septic tank . Its about a 1930ish system.
    Just wondering, if I replaced the old fashioned toilet, if the new modern low flow toilet would have enough water discharge to flush things out to the septic tank ?
    The existing system as is works fine and always has, but eventually want to put in all new bathroom fixtures.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,001
    Location:
    Bothell, Washington
    With that distance it will be fine.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,623
    Location:
    Cave Creek, Arizona
    The toilet does NOT care where its waste is going. If it will work with a 100' line to a city sewer, it will work for a septic tank.
  4. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
  5. Ten High

    Ten High New Member

    Messages:
    3
    Location:
    Upstate New York
    Everyone, thank you for the answers. Will check out the modern fixtures knowing this.
  6. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,348
    Location:
    Yakima WA
    Just keep in mind, low flow toilets are not equal. Do heed the advice on Terry's web site.
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