They're used so your water heater can be set to a high temperature (supposed to limit legionella bacteria) but yet have the temperature in the lines reduced to a safer temperature.

I would think that there would be bacteria issues, that removal should be done with respriator and protective gear.

Compared to the total population, this is a very small percentage of deaths, compared to that of other diseases, viruses, and bacteria.

Quartz is also more hygienic/bacteria free.

“We” will not pay for loss or expense due to the cancellation ofany lease or agreement.This coverage does not apply to loss caused by “fungi,” wet ordry rot, or bacteria other than as provided under ADDITIONALPAYMENTS, Fungi, Wet Or Dry Rot Or Bacteria Coverage.Fair Rental ValueIf an insured property loss covered under PROPERTYPROTECTION—SECTION I, OUR PROMISE—Dwelling Coverage,OUR PROMISE—Other Structures Coverage or OUR PROMISE—Personal Property Coverage, makes “your” “residence premises”uninhabitable, “we” will pay for “your” loss of normal rentsresulting from the loss, less charges and expenses which do notcontinue while the rented part of the “residence premises” isuninhabitable.

Some things to consider...detergents with phosphates, chemicals or heavy cleaners will harm the helpful bacteria in the septic system.

From my understanding they are nothing more than bacteria cultures specifically designed to target the issues in a particular part of your system.

The inside wall cavities are filled with dirty water, and lots of bacteria. 

The expensive caulk expands and contracts with the weight of the tub preventing leaks unlike the cheap caulk that leaks and harbors bacteria growth.If a bathroom doesn't have a ceiling exhaust fan but a window for ventilation do not expect the tenant to open that because of being lazy or the weather outside.

Have water source tested for nitrates and bacteria since you’re hosting people on site.Check equipment out.Make sure contract includes an inventory of personal property so it doesn’t walk.