I've been using the pH Recharge, 3-filter countertop water filter for 3 years now. I replace the filters every 3 months for 2 people. I love the ease of use and peace of mind I get with this product. The water tastes great, and it's a big part of my detox program. I suffered from fluorosis as a child from swallowing Crest toothpaste. Back then, it contained 4 x the toxic level of current allowable FDA levels of fluoride, and I was just a toddler when it first came onto the market. I was plagued by tooth and joint problems my whole life as a result. Chelation therapy along with my Invigorated water filter have restored my health. I cannot recommend this product more highly!