> What's effective to put in the toilet tank to prevent those brown rust
> stains in the toilet from hard well water?
That "rust" is more likely Iron Bacteria and is very pervasive. We have
learned to live with underwear (Bleach not kind to a Septic tank) that
is no longer white and stains in the dishwasher. We occasionally use
Rust-Out but is tedious to use and expensive.
For the toilet we got a thing called "Kaboom" dumbest name ever. It uses
large white Chlorine tablets and hangs in the tank ABOVE the water level
so it does not affect the water in the toilet tank. I had tried some of
the in-tank things and they ate the rubber seals.
Anyway, the kaboom tablets are expensive so I got some Brominator
tablets for cleaning swimming pools. About 30 x 1" diameter tablets for
Honey has not had to clean the toilet bowls for two years. Awesome
I have nothing to do with Kaboom or the bromine tablets, just a very
For stains already n the bowl, use Rust-Out and make a loose-paste
(pancake batter) and brush it on. It has to "work" for about 20-minutes
so you need to go back every five minutes and brush some more on as it
dries out and stops working. A royal pain, but once the stain is gone
the tablets will keep it that way.