Aquapure by cuno hot water system protector to reduce scale build up in pipes and extend life of water heater. Installs on cold water side of hot water system to inhibit scaling and corrosion. Whole house scale inhibition water treatment system. Ap430-10 features: -product type: whole house -filter component: filtration system -filter change indicator: no. Dimensions: -overall HEIGHT - top to bottom:13 -overall WIDTH - side to side:2 -overall depth - front to back:2 -overall product WEIGHT:2.25 .