That's $52/year per faucet. I've got four faucets in my home that a child could reasonably drink from. That's $200/year and 48 filter changes assuming you don't miss any changes. And that doesn't help with showers and baths, or even pools and hose water.

Compare that to a whole-home filter: under $500 with a five year warranty. Filters are a couple hundred bucks every 100,000 gallons. The time savings alone is worth it, but the real value is knowing that you're not relying on $1 plastic filters.

Nothing about these $1 filters is good for children. The idea that a household with kids has the time and energy to change filters on every faucet once a month (ignoring all the time your kids spend at school with lead water there!) is laughable.