The Kohler toilets we got in 2021 are bottom of the line. They do not have a strong flush and therefore can leave some waste behind in the bowl which is not good for keeping it clean.
We have a Nova whole house filter and also their water softener and we get the black stuff even though our toilets are frequently used and cleaned.
I have used the pumice stone and it works great for removing rings.
There are toilet bowl products where the bleach sits in a container inside the tank and some is released with each flush, so I believe that would avoid damaging inside the tank. Kohler makes self cleaning toilets where the flush is stronger and it has an enclosed area in the tank to put in a cleaner - that's our next step eventually. It's also smooth on the outside base making it easier to clean there as well.
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