ISPRING WDS80K Anti Scale Whole House Water Filter with Patented Scale Inhibitor, 4.5 in. x 10 in.ISPRING has been dedicated to providing high quality drinking water to families across the country since 2005. Anti Scale Whole House Water Filter with Patented Scale Inhibitor is another quality product added to ISPRING domestic water filtration systems. Choosing from WDS80K or WDS150K to inhibit scale build up and provide your household appliances and plumbing with impressive descaling protection.