Our southern Arizona water is undrinkable without filtration, and these do nicely, When they offer specials and you buy in quantity, the cost comes down to about $14.00 per filter, and one can last 30-45 days, depending on usage. Unfortunately, the company doesn't seem to offer specials any longer. (I thought they'd gone out of business.) But now that I'm down to my last filter, I think I'll look elsewhere for a water filter solution. Last year, they had a security breach and didn't really handle it well, in my opinion. (I was notified BY MAIL even though I order online. The notice that my card could be compromised arrived on a Saturday. Nice.)