I love these filters. Perfect fit. My husband helped me take apart our EcoSoft Countertop water filter. I thoroughly cleaned every part. We do have very good water where we live in the New England. But adding this filter makes the water even better. Other locations we live, we do use a reverse osmosis system. But this is all we need where we live now. I use the filtered water for our dogs, us, coffeemaking, making punch, etc.........