we have a jurassic park sound every 3rd or 4th time we flush 1 of our 2 toilets. what is the sound?our house was built in the early 50's, we have been here a long time and this has never happened before.March 14 2010 - Oakland0YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.