Any flush/flat door, hollow or solid I replace with hollow core molded  panel doors. any solid style and rail panel doors I try and keep.

But it definitely would have caught this or intentional abuse of the system (intended or not) like flushing 4,000 condoms over the years.  

Just a toilet and sink on a 1/2 inch will slow down the sink when toilet is flushed.

Doors don't shut and master bathroom toilet can't flush due to the foundation.

I dumped a few 5-gallon buckets of hot water down there hoping to flush it out.

What do you use for a hot water heater, what happens when a person flushes the toilet, etc?

Pretty soon you think you're flush with cash when you're really flush with debt.  

I"ve already told the tenant not to flush feminine napkins and baby wipes...they are fine doing that.Let me know if you'd like to share the contact!

Flush test failed and the water is off.

Just in case you accidentally bankrupt yourself.Startup thoughts: If you are fine flushing money away but think you have a good grasp on something missing online, you could use a tiny portion to try your startup idea if it's really killing you with the expectation you will fail (because most just fail).