This spring, my husband installed an undersink, tankless, 8 stage water filter system in our kitchen, which we purchased online. It came with a separate faucet, which we installed in the hole that our soap dispenser had been in.
The company states the filters can remove many contaminants such as metals, including reducing bacteria with diameter larger than 0.0001 um.
Since I don't believe everything that companies claim, I use the water out of this independent faucet to still boil my drinking water and the water I use to boil nebulizer parts. I also use this faucet for washing fruits & veggies and feel it is safer than using the city water.
Previously, I had to scrub the mineral residue left in my boiling pan or glass carafe after boiling, when using our other existing faucet with city water. I now don't have any mineral deposits collecting in my containers after boiling. This also eliminated plastic containers & lugging home gallons of distilled water or spring drinking water. I store extra boiled drinking water in glass bottles, which I transport to my bathroom sink for use there to brush teeth, etc.
As there are many companies, we did much research online into undersink filter systems, that would meet some of my concerns, wouldn't break the budget & not be too difficult for my husband to install.