http://www.woodsmall.com/WATER-LEAKS-WATCHDOG-ALARM.txt  12/11/2021

WATER LEAKS CAN BE VERY COSTLY

Having been "burned" once, decades ago, by a leak in a refrigerator ice maker water line,
I USE $14.53 (Home Depot) WATCHDOG WATER ALARMS AT EVERY LOCATION OF A POSSIBLE WATER LEAK:

Water heaters, dishwashers, ice maker water lines, all toilets and all sink locations.

The Watchdog water alarm has saved me several times over the years.
Takes one nine volt battery - my batteries seem to last me about two years (there is a
low battery CHIRP alert).

The bottom of the sensor must be placed DOWN on where water from a leak would accumulate.
The sensor plate is removable, if desired (so the alarm unit can be 6 feet away).

You do have to be home to hear the alarm.

https://www.homedepot.com/p/Basement-Watchdog-Battery-Operated-Water-Alarm-BWD-HWA/100038838

My personal advice, NEVER use a plastic water line for a toilet connection - fire departments
tell me that these often break. My neighbor's plastic line broke and put 5 inches of water (depth)
in her apartment.

I use hoses with a stainless steel (NOT plastic) jacket around them - seems to prevent leaks
(for over 28 years). I would replace very old toilet waterlines unless they are completely
made of metal (no metal appearing plastic lines). Just my personal advice (I am not a plumber
nor a fireman).