This ion water filter is perfect for anyone looking for the most quality wash possible. This filter not only removes larger particulate matter from the water to keep your bidet seat safe, but also softens the water. This is done by adding negative ions. Softer water means less surface tension, which allows the water to clean better as it can spread more evenly over the surface. If you're looking for the best clean possible, one of these filters is a must-have. Filters work for approximately 410 gallons of water, which under normal household use will last 6 to 9 months. Both ends of the filter offer a 1/2 inch thread, making it a perfect fit for nearly any bidet seat on the market. Those looking for the best wash from the Cascade 3000, will want to get their hands on a few of these ion filters.