Tracked by Evreward since 2012, Factory Direct Filters offers coupons, cash back rebates and rewards, with savings as high as 15% off. Factory Direct Filters discount coupons are seasonal, appearing every three to four months, and are often more valuable than similar merchants. Even when Factory Direct Filters doesn't have a coupon, you can always get up to 10% cash back, and other great rewards, with every purchase.