"freshly produced". You think it's magic? Do you only drink from "freshly produced" sources as most of it goes down a drain?

What aspect of it do you think is offered for the cat if it's an infinitely dripping tap vs being changed regularly? Putting kidney failure on the fault of water quality alone without a source is pretty asinine.

You're supposed to change the water as often as stagnant water bowls and it comes with filters that you're supposed to change regularly (carbon and fiber)

To run it in a circle is the same as leaving it to sit stagnant in a bowl except with extra dust collected from the air.

Some cats will genuinely drink more from moving water. Other cats love water with some waterplants in it. And yet more cats would rather lick from muddy puddles than drink fresh clean water.

Regardless, these fountains usually have filters.

Rig up a constantly dripping faucet and maybe your cat's kidneys will stop failing after a few years.

Cats as a species have weak kidneys. Cat kidney failure is kinda like human cardiovascular disease. Older humans get, the more likely their cardiovascular system gives out, and the older cats get, the more likely their kidneys are to fail.

Dust in water is not a contributor to kidney failure unless you work on a lilly farm or aspirin factory or something.