As one of its daily deals, Home Depot takes up to 23% off a selection of home water filtration and softener systems. Plus, all orders qualify for free shipping. Deal ends today. A few best bets: Pelican Water Carbon Water Filter System 1-3 Bathrooms for $639.20 (pictured, low by $160) Pelican Water Filtration and Salt Free Softener 1-3 Bathrooms for $1,759.20 ($528 off)