Tracked by Evreward since 2009, Aquasana offers coupons, cash back rebates and rewards, with savings as high as 60% off. Aquasana discount coupons are somehwat rare, available a few times each year, but are often more valuable than similar merchants. Even when Aquasana doesn't have a coupon, you can always get up to 20% cash back, and other great rewards, with every purchase.