Using two-step filtration technology, the HF-31 Brondell H2O+ Cypress Composite Plus water filter will help maintain or improve your water quality by reducing sediment including sand, silt and rust. Quick-Connect system makes installation fast and easy. For best results, this genuine OE filter should be replaced every six months. Order the HF-31 Brondell H2O+ Cypress Composite Plus water filter you need to ensure the highest quality, greatest tasting water is served in your home. First stage of a three-stage filtration system.