The WaterBoss Model 700 is ideal for households of 1-4+ people and can soften up to 70 grains per gallon while reducing up to 10 ppm (parts per million) of ferrous iron, direct and sediment. Made in the USA and designed for optimal performance and efficiency, requiring the least amount of salt and water necessary to complete the regeneration. Features include a built-in, self-cleaning whole-house filter, regenerates in just 20 minutes and treats most city and well water problems.