I swear by IW filters..I've been using them for 2 years now. Our quality of life has drastically improved over that course of time. About 3.5 weeks ago our IW shower head cracked. We had to wait for restock and decided to by the filter attachment instead of the shower head. Showering in our local tap for that period of time had a tremendous impact on our health. The water smelled bad, our skin felt dirty still. We were tired after showering. Our skin was dry. My hair got oily faster. It threw off our PH balance so when we sweat we smelled worse. The only sink that doesn't have a filter in our home is our bathroom sink. We're looking into replacing it.