Washing Machine Filter for Hardwater Filter for hard water, dust & rust Protects your machine from hard water & scaling Improves wash quality Increases life of machine Replace cartridge every 4-6 months. Hard water can damage your washing machine drum reducing its life and wash quality. Use IRIS Washing Machine Filter to protect your machine from the effects of hard water. This compact filter filters the water entering your machine preventing impure water from entering. This keeps the drum clean and improves the wash quality leading to brighter clothes and a long-lasting machine. Life of WMF Top load: 4-6 months Front load : 5 - 6 months