Backfill around a sewage basin?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by cacher_chick, Nov 23, 2010.

  1. cacher_chick

    cacher_chick Test, Don't Guess!

    Jan 5, 2008
    Test, Don't Guess!
    Land of Cheese
    In my spare time I am stubbing in a basement bath. I started by digging the hole for a sewage basin and found the soil to be clay. We do have a seasonal high water table so I bought the Zoeller basin with the anti-float flange on the bottom.

    I tend to over-think things, but I don't feel that I will be able to adequately compact the native clay around the basin without making the slab cut bigger than I'd prefer to tamp around the basin. Obviously, washing loose clay in with water would be a real mess. I'm thinking about using a mix of sharp sand, clay, and pea gravel, but I'm interested in hearing what the pro's think.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Wash sand in with a hose. The basin is not going to go anywhere. Just do not use so much water that the basin starts to float, (fill it with water first to prevent it from happening).
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