I have well water that is very high in iron. Even after filtering, the softener, and yet another filter system it still has a funny taste in my opinion. I don't care to drink it. We drink nothing but spring water so I stick with the spring water for brewing. The RO water at the local grocery stores have what I would consider an off taste as well. So spring water it is for my brews. A few extra bucks to ensure nothing in the water effects the taste of the final product is worth it in my book.