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ilvtravln's avatar
ilvtravln
Explorer II
Feb 01, 2019

Bubbles in toilet ???

Sometimes bubbles come up in the toilet, it does not matter if the black tank is partly full or empty. Any ideas why this occurs?
Thanks

12 Replies

  • I'm guessing you have a "pile" right at the base of the pipe where it drains into the tank. Being as they are only 5-8" deep it doesn't take much to partly obstruct whats coming down the pipe. Perhaps fill the tank with fresh water and let it sit a few days, then drain/fill again. Can you shine a flashlight down the toilet to see if you see the tank? When our tank "burps" its either near full or cant get air behind water.
  • Might be a blocked vent. Could be critters have blocked it by nesting or dying in it. Worst case would be if the vent pipe itself has dropped into the tank.

    Lyle