It depends on why you are looking for a filtration system. My husband use to install them and has always been a bit of a freak about water. We used the reverse osmosis, but it filters out even the good stuff and have to change the filters. At one time we were using a Brita pitcher and PUR filter on the faucet, which was just ridiculous. Now we have a whole house water filter, which originally I thought was ridiculous but now love it and requires no maintenance. And then we have a water ionizer at the kitchen sink. Feel free to PM me, I know a little about the water filtration only because I have been around my husband and his particular water habits, or I can ask my husband if you have specific questions, like I said, he used to install them, (not anymore, so he won't be pushing you to buy something).