This varies widely. My SubZero fridge filter, for instance, costs $55, and is rated for 750 gallons or 1 year, whichever comes first: https://www.subzero-wolf.com/assistance ... ion-system
I know you keep repeating the same thing, which doesn't make it true. Here are scientific, peer review papers regarding the risks associated with reverse osmosis:Health concerns? Well, your $55 carbon filter will not filter arsenic, calcium, or salt. It will not eliminate ALL heavy metals like lead that are extremely harmful to the human body.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC182827/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4223198/
There's more out there.
Right, and remineralized water comes with its own risks. See the second article above.Again, if you are worried about the demineralization issue get the cartridge to re-mineralize the water.