One has thousands of abandon properties and many were recently abandon, almost like a bomb went off and the other is a thriving top to bottom healthy market flush with investors from the entire planet.

When the toilet is flushed while showering, the water level in the toilet rises high (close to over topping).

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

(Examples of improper use include overloading electrical outlets, flushing large, foreign objects down the toilet, and allowing any gas, electrical or plumbing fixture to become filthy.)c) Dispose of trash and garbage in a clean and sanitary manner.d) Not destroy, damage, or deface the premises, or allow anyone else to do so.e) Not remove any part of the structure, dwelling unit, facilities, equipment or appurtenances, or allow anyone else to do so.f) Use the premises as a place to live, and use the rooms for their proper purposes.

Flush the water heater.6.   

Young women almost always flush tampons unless someone tells them not to -- you took your hit and now you know. 

Technically you are supposed to flush your conventional water heater tank once a year, which is a major task, but in reality nobody does that.There is no significant delay between tankless than with a tank. it's mostly however long it takes for the hot water to run through the pipes to your faucet.

Can't repress interest rates and shove money into the economy for that long and not get this on the other side.The bad investors will get flushed out, and the good ones will hang on and come out the other side with a few more grey hairs.

People who rent will flush things that the system can not handle. 

Funny someone posted about "dealing with broken toilets" - in 9 years of doing this, that maybe happened once because a tenant tried to flush a toothbrush.