Keep your Vax Fresh Combi steam mop performing at its best with this pack of three Vax Replacement Hard Water Filters. Designed for hard water Depending on the water hardness in your area and how often you use your steam mop, you should aim to change the filter every six months. The Vax Type 4 Replacement Hard Water Filters come in a pack of three, so you can keep your steam mop cleaner for longer and enjoy optimum results use after use. Maintain your floor cleaning equipment with the Vax Replacement Hard Water Filters triple pack.